DaniWeb IT Discussion Community - C++

Need this program done by tonight. Any help would be great.

bigmaq — Sat, 21 Nov 2009 20:59:26 GMT

So I am programming a heap sort and i am gettin pretty close to where i need to be, but I am having trouble in one of my functions when it heapifies my array. here is the code.

#include

using namespace std;

    

class Heapsort

{

  private:

     int *array;

     int mysize;

  public:

     Heapsort(int);

     ~Heapsort();

     bool empty();

     int percolate_down(int);

     void heapify();

     void fill_array();

     void print();

};

    

Heapsort::Heapsort(int a)

{

   mysize = a;

   int *array = new int[mysize];

}

          

Heapsort::~Heapsort()

{

   delete [] array;

}

          

void Heapsort::fill_array()

{

    int i;

     

    for (i = 1; i < mysize; i++){

       cout << "\nEnter a number: ";

       cin >> array[i];

    }

 

    print();    //This is here to check for the error im getting.

}

 

int Heapsort::percolate_down(int r)

{  

    int t=0;

    int c = 2*r;

    

    while (r < mysize){

        if ((c < mysize) && (array[c] < array[c+1])){

          c++;

        }

        if (array[r] < array[c]){

          t = array[c];

          array[c] = array[r];

          array[r] = t;

          r=c;

          c=2*c;

          print();  //Again, checking the error, the print out shows that

        }else{    //the data somehow changes in the middle of loop

          break;

        }

    }  

    return (r);

}



void Heapsort::heapify()

{  

   int r = mysize/2;   

   

   for(r; r > 0; r--){

      percolate_down(r);

   }    

 

}        



void Heapsort::print()

{ 

  int j;

  cout << endl << endl;

  for (j=1; j < mysize; j++)

        cout << array[j] << "  ";

}

        

int main()

{

  Heapsort heap(7);

  

  cout << endl << endl;

  

  heap.fill_array();

 

  heap.heapify();



  heap.print();

   

  cout << endl << endl;

   

  return (0);

}

And this is the out put i am getting.

AFTER I INPUT THE INTEGERS INTO ARRAY:
1 2 3 4 5 6

DURING MY WHILE LOOP IN PERCOLATE_DOWN():
1 2 6 4 5 3

1 5 6 4 2 3

1 5 6 4 671410272 3

6 5 1 4 671410272 3

6 5 3 4 671410272 1

6 5 3 4 671410272 1

I have no idea why in the middle of the loop, the data point just changes.

p.s. I havnt gotten to the sorting part, this is just up to put the data into a heap.

[VC++ 6] Debugging ASM Code?

scriptkiddy — Sat, 21 Nov 2009 19:48:08 GMT

Hi, I heard that I can see how VC++ 6.0 converts my C++ code to assembly so I can rewrite it in assembly while removing useless junk. Could somebody tell me how this would be done?

Well, guess ill just use ollydbg to see how my programs converted

The do-while that doesn't

richman0829 — Sat, 21 Nov 2009 19:31:42 GMT

Everything below works the first time through, and the validation of the user's choice to proceed or not works, as does his choice to quit; but when it gets to cin.getline it just blows right through it without waiting for input. As my parents used to say, Where have I gone wrong?

//CIS 180 Rich Mansfield 0457321 11/20/09

//This program checks to see if an input is a palindrome



#include

#include

#include

#include

#include

using namespace std;



int main()

{

        const int MAX = 81;//Array size; no magic numbers; last char is null terminator

        char str[MAX];//Array to hold raw user input

        char proceed;//To allow user to choose to proceed or not, after initial run

        

        do //one time initially; user gets to choose to repeat or not at end

        {

           // Get a line of input.

          cout        << "Input a string of no more than "

                        << (MAX - 1) << " characters:\n";//saves last space for null terminator

           cin.getline(str, MAX);//getline allows white space chars

           //Doesn't pick up getline on second iteration

           

           // Display the input one character at a time.

           int count = 0;// Loop counter variable

           cout << "The sentence you entered is:\n";

           while (str[count] != '\0')

           {

              cout << str[count];

              count++;

           }        //End while going through string

        

        int strlength;//var used to find pairs of characters to compare

        strlength = strlen(str);

        cout        << endl        << endl;

                

        //Convert all the characters in the string str to uppercase

        for(int i = 0; i < MAX; i++)

                if(str[i])//if there IS a character at that location

                        str[i] = toupper(str[i]);//make sure it's uppercase (if already upper, no change)

        cout        << str        << endl        << endl;

                

        //Remove all the special characters except letters a - z

        char str2[MAX];//Will need a new string to hold just the alpha dogs

        int j=0;//and a counter for its elements

        

        //str2 is declared to max out at 81, but I don't have to look at all of it

        for(int i = 0; i < strlength; i++)//strlength is all I need to look at

                if(isalpha(str[i]))//if the next character is a letter,

                {        

                        str2[j] = str[i];//pass it into the new string

                        j++;//increment j to go to next element in new string

                }         //End of if isalpha

        str2[j]= '\0';//Put null terminator at end of new string

        cout        << str2        <<        endl

                << "strlength is "        << strlength        << endl

                << "j is "                        << j

                << endl        << endl;

                

        int        back = j - 1;//back index points to the last character, drops the \0

        int        flag = 1;//start with true value for flag; set to break if it goes false

                

        //Compare the first character with the last character.

        //If they're are the same, compare the next characters.

        //front index is pointed to the first character in the string str2

        for(int front = 0; front <= j/2 ; front++)//j is the position of the \0 in str2

                //so j/2 is the midpoint that both back and front are converging on;

                //as long as front < j/2, it keeps incrementing.

        {

                if(str2[front] != str2[back - front])//comparing first element (0)

                        //to last element (j - 1, or back, is last element, not counting \0

                        //subtracting front el doesn't change that, at first, because 1st position is 0

                        //but from then on, back decrements as fast as front increments

                { 

                        flag = 0;

                        break;

                }  //End if string pairs not equal

        }        //End for loop comparing all pairs of characters

                

        

        if(flag == 0)

                cout        << "It is not a palindrome"        <
        else

                cout<<"It's a palindrome"<
                

        //Re-initialize basic array in case user wants to do it again

        //Nope; doesn't work whether I have the next two lines, or not

        const int MAX = 81;//Array size; no magic numbers; last char is null terminator

        char str[MAX];//Array to hold raw user input

                

        //Does the user want to do it again? pg495

        cout        << "One more time? (y/n) ";

        cin        >> proceed;



        //Validate response

        while (tolower (proceed) != 'y' && tolower(proceed) != 'n')

        {

                cout        << "Please enter y or n: ";

                cin        >> proceed;

        }

    }        while (tolower(proceed) == 'y');//End do while

        

        return 0;

}        //End main fn

Overloaded function

maverick405 — Sat, 21 Nov 2009 19:24:01 GMT

I am trying to code the below program using overloaded function which give me output is the answer in correct or not for the three different question, the answers are already provided in the program all I have to check the answer and give the output statement if the answer is correct or incorrect, I am able to run the below mentioned code but the output is weired, please look at it and help me with this.

#include 

#include 



using namespace std;

void checkQuestion(int, string, bool);



int main(int argc, char *argv[])

{

    int intAnswer = 3;

    string stringAnswer = "Abraham Lincoln";

    bool boolAnswer = true;

    string result[]={"correct", "incorrect"};

    

    void checkQuestion (int intAnswer);

              

              if (intAnswer == 3)

    {

         cout << "This answer is " << result <
    }

        

   void checkQuestion (string stringAnswer);

   

             if (stringAnswer == "Abrahim Lincoln")

   {

        cout << "This answer is " << result << endl;

   }

   

  void checkQuestion (bool boolAnswer);

  

           if (boolAnswer == true)

  {

       cout << "This answer is " << result << endl;

  }



system("PAUSE");

return EXIT_SUCCESS;

}

Voila! Syntax-highlighting!

Integer array and memory allocation

StaticX — Sat, 21 Nov 2009 19:09:31 GMT

Hi, i am making a program that contains an integer array of an unknown size.The user is prompted to enter numbers into the array,and press 'x' to exit.

What i am going to do then,is to pass the array from the main into a class which contains another array,but before i do that i wanted to allocate the required space for this array in my class.

Here is what i have done so far(i have made a small test program with a function instead of included class files)

#include 

#define MAX_SIZE 50



using namespace std;



void Malloc(int _array[]);





main(){



  int array[MAX_SIZE] = {};

  char exit;



  // enter numbers into an array

  for(int i = 0; i < MAX_SIZE; i++)

  {

      // if user enters x program will stop input to array.

      if(exit == 'x')

      {

          break;

      }



      cin >> array[i];

  }



  for(int i = 0; array[i] != '\0'; i++)

  {

      cout << array[i];

  }



  Malloc(array[]);



}



void Malloc(int _array) {



    int size;

    int classArray[];



    // Find the size of the array passed in as an argument.

    for(size = 0; _array[size] != '\0'; size++);







    classArray = (char*)malloc(size+1);





    for(int i = 0; _array[i] != '\0'; i++)

    {

        classArray[i] = _array[i];

    }







}

Does anyone have any suggestions as to what im doing wrong?Any help is appreciated.

Need help using the find() function

reese27 — Sat, 21 Nov 2009 18:40:16 GMT

I have two vectors--one with the name of the class and one with the abbreviation of the class. The name of the class is in the same position of the abbreviation in the different vectors. I want to make it to where if I input "AERO" the output should be Aerospace Engineering using find().

Issues with Point of Sale program

stefanief — Sat, 21 Nov 2009 18:39:48 GMT

I am trying to write a point of sale program. I need to display the menu, the operator enters the lunch order. Total bill is calculated with sales tax, customer payment is accesped and change (if any) is calculated. order summary should be written to a log file that includes the date, time, number of items sold, the order total without tax, and the tax amount. Log file should be displayed. Then the last order should be cleared and a new order can begin. At the end of the day the operator will select to "end the program". I am very overwhelmed. Here is what I have so far. I'm looking for some confirmatio on what I've written and a bump in the right direction of where to go from here. Sorry, it's kind of messy. If I'm posting this incorrectly could someone please let me know? Thanks.

#include
#include
#include
#include

using namespace std;

//declare function prototypes
displayMenu();
double calctax(double saleAmount, double taxRate);
double calctotal(double saleAmount, double taxAmount);

int main()
{
//declare variables
int number;
double sale = 0.00;
double tax = 0.00;
double rate = 0.0;
double sum = 0.00;
double total = 0.00;
double quantity = 0.0;
char response;
double sumItem = 0.00;
char menuItem;

//display operator choices
cout << "Enter 1 to start the data entry mode " << endl;
cout << "Enter 2 to display the log file " << endl;
cout << "Enter 3 to Quit the program " << endl;

cin >> number;

if (number ==1)
displayMenu;
else if (number == 2)
displayLogFile;
else if (number == 3)
endProgram;
else
cout << "Invalid Entry" << endl;

//Ask operator for orders
cout << "Enter the first letters of the menu item ";
<< "the customer has ordered: ";
cin >> menuItem;
cout << endl;

switch (menuItem)
{
case 'ha':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 2.29 * quantity;
break;
case 'ch':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 2.49 * quantity;
break;
case 'sa':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 3.99 * quantity;
break;
case 'fr':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 1.49 * quantity;
break;
case 'so':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 1.75 * quantity;
break;
case 'la':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 2.49 * quantity;
break;
case 'sm':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 1.29 * quantity;
break;
case 'ca':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 2.49 * quantity;
break;
case 'pi':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 2.29 * quantity;
break;
case 'ic':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 1.99 * quantity;
break;
case 'co':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 1.15 * quantity;
break;
case 'te':
cout << "Enter the quantity ordered: ";
cin >> quantity;
cout << endl;
sumItem = 1.05 * quantity;
break;

default:
cout << "Invalid entry." << endl;
}

cout << "Order another item: Y or N";
cin >> response;
cout << endl;

while ( response == 'Y')
cout << "Enter the first letters of the menu item "
<< "the customer has ordered: ";
cin >> menuItem;
cout << endl;

//call the tax calculation function
tax = calctax(sale, rate);

//call the total bill function
total = calctotal(sale, tax);

return 0;
}

void displayMenu()
{
cout << "Hamburger $2.29" << endl;
cout << "Cheeseburger 2.49" << endl;
cout << "Sandwich 3.99" << endl;
cout << "French Fries 1.49" << endl;
cout << "Soup 1.75" << endl;
cout << "Large Drink 2.49" << endl;
cout << "Small Drink 1.29" << endl;
cout << "Cake 2.49" << endl;
cout << "Pie 2.29" << endl;
cout << "Ice Cream 1.99" << endl;
cout << "Coffee 1.15" << endl;
cout << "Tea 1.05" << endl;
}

//function to calculate sales tax
double calctax(double saleAmount, double taxRate)
{
return (saleAmount * taxRate);
}

//function to calculate total sale
double calctotal(double saleAmount, double taxAmount);
{
return (saleAmount + taxAmount)
}

Parameters in OO c++

Ciganjo — Sat, 21 Nov 2009 18:26:25 GMT

Hi Im really stuck on one problem. I trying to save some data to a file.
im using Borland compiler.
the challenege is to create a new product and save its details to a text file.
1. the user inputs product details i.e. Barcode, Name, Price, and quantity via the interface
2. the user clicks on save button, and it creates a file to which the information is saved

heres what ive got so far:

Product.h file

class Product

{

        private: 

                        AnsiString BarCodeField[];

                        AnsiString ProductNameField[];

                        double PriceExVAT;

                        double PriceIncVAT;

                        int CurrentSupplyField;

                        int MinimumSupplyField;



        public:

                        void CreateNewProduct(AnsiString theBarCodeField[],

                                                                  AnsiString theProductNameField[],

                                                                  double thePriceExVAT,

                                                                  double thePriceIncVAT,

                                                                  int theCurrentSupplyField,

                                                                  int theMinimumSupplyField);





                        AnsiString getBarCode();

                        AnsiString getProductName();

                        double getExVAT();

                        double getIncVAT();

                        int getCurrentSupply();

                        int getMinimumSupply();



                        Product();

                        ~Product();



};

Product.cpp file

Product::Product()

{



}



Product::~Product()

{



}



void Product::CreateNewProduct(AnsiString theBarCodeField[],

                                                                AnsiString theProductNameField[],

                                                                double thePriceExVAT,

                                                                double thePriceIncVAT,

                                                                int theCurrentSupplyField,

                                                                int theMinimumSupplyField)

                                                                {

                                                                        BarCodeField[] = theBarCodeField[];

                                                                        ProductNameField[] = theProductNameField[];

                                                                        PriceExVAT = thePriceExVAT;

                                                                        PriceIncVAT = thePriceIncVAT;

                                                                        CurrentSupplyField = theCurrentSupplyField;

                                                                }

//---------------------------------------------------------------------------

AnsiString Product::getBarCode()

{

        return BarCodeField[];

}

//---------------------------------------------------------------------------

AnsiString Product::getProductName()

{

        return ProductNameField[];

}

//---------------------------------------------------------------------------

double Product::getExVAT()

{

        return PriceExVAT;

}

//---------------------------------------------------------------------------

double Product::getIncVAT()

{

        return PriceIncVAT;

}

//---------------------------------------------------------------------------

int Product::getCurrentSupply()

{

        return CurrentSupplyField;

}

//---------------------------------------------------------------------------



int Product::getMinimumSupply()

{

        return MinimumSupplyField;

}

//---------------------------------------------------------------------------

AddProductForm.cpp file

void __fastcall TForm2::AddToStockClick(TObject *Sender)

{

        FILE * FSave;



        theProduct.CreateNewProduct(//???????? HELP PLEASE!!!!!!! WHAT PARAMETERS GO HERE???

                                                                //BarcodeBox,

                                                                //ProductName, 

                                                                //ExVAT,

                                                                //IncVAT

                                                                //CurrentSupply->Text,

                                                                //MinimumSupply->Text

                                                                ); ???

        {

                strcpy(theProduct.getBarCode, BarcodeBox->Text.c_str());

                //i want to copy the data from a TEdit box into the getBarCode variable and save it to file

        }



if(SaveDialog1->Execute())

        {

                FSave = fopen(SaveDialog1->FileName.c_str(),"w");

                ProdConfirm->Visible = true;



                if(FSave == NULL)

                {

                        MessageBox(NULL,"The file could not be saved","Error", MB_OK);

                        return;

                }



                fprintf(FSave, "%s\t", BarCodeField);

                fprintf(FSave, "%s\t", ProductNameField);

                fprintf(FSave, "%.2f\t", PriceExVAT);

                fprintf(FSave, "%.2f\t", PriceIncVAT);

                fprintf(FSave, "%s\t", CurrentSupplyField);

                fprintf(FSave, "%s\t", MinimumSupplyField);

        }

        fclose(FSave);

How do I disable console output?

mybluehair — Sat, 21 Nov 2009 18:20:22 GMT

I've got a library that is annoying me. When I command it to do what I need it to do, it spits out a bunch of text onto the screen that I don't need.
Is there a way to temporarily "mute" a console program, then re enable it later?

This is what I have found from Google:

     std::streambuf* cout_sbuf = std::cout.rdbuf(); // save original sbuf

    std::ofstream   fout("/dev/null");

    std::cout.rdbuf(fout.rdbuf()); // redirect 'cout' to a 'fout'

  std::cout.rdbuf(cout_sbuf); // restore the original stream buffer

But that comes up with TONS of errors.

Any ideas? Thanks guys :)

User calling functions in the program

gsingh2011 — Sat, 21 Nov 2009 16:56:36 GMT

I'm making a graph theory problem solver and basically I made a bunch of functions that will set up the graph and allow the user to modify the graph, but obviously these functions can only be called from the program. The user can't just type the function name and expect the function to be called unless I do a lot of string parsing. For example, for the function, initGraph(graph *g, bool directed), I have to do the following,

if (command.length() > 10){

        if (command.substr(0, 9) == "initGraph") {

                if (command.substr(10, 1) == "1")

                        directed = 1;

                else if (command.substr(10, 1) == "0")

                        directed = 0;

                if ((i >= 0 && i <= 9) && (directed == 1 || directed == 0)) {

                        g[i] = new graph();

                        initGraph(g[i], directed);

                        i++;

                }

        }

}

(Even though my function takes two parameters I only made it so the user has to input one. Most functions require the user to input both parameters.)
I haven't even added the code to make sure there are parenthesis around the parameters and other small details. Other functions also have more complex parameters so string parsing is possible but it is a very long process. Is there a better way to do it without all of this parsing?

it's a home work , please help me

Ahmad Shaheen — Sat, 21 Nov 2009 16:20:48 GMT

Write C++ program to do the following:

• Define a Double Linked Lists EmpRank where the data should be of type integer.
• Enter 10 Employee Ranks, where each rank should be inserted in EmpRank with respect to its value as ascending order its ordered
• Print out the EmpRank in two ways, forward and backward, starting from the pointer position
• Function to delete all ranks which it is not divisible by 3 out how many marks is greater than a user defined mark.

linker error

SDPRIYA — Sat, 21 Nov 2009 15:45:42 GMT

i often get linker error
"undefined symbol _main in the module c0.asm"
when running the c files .. how can overcome this error

Code Snippet i need help

Fajer91 — Sat, 21 Nov 2009 15:38:00 GMT

Hello everyone i'm a new member , i need ur help with this code ,
i want to write a for loop that assigns the 3rd row of the array to 0,, and then print out the array after setting the 3rd row to 0.

Thoughts about Qt

llemes4011 — Sat, 21 Nov 2009 15:13:10 GMT

The company that I work for just bought a Qt License, so we've been messing around with it. So far, it's really nice. I'm more of a Java guy, and it's made the transition from Java to C++ much easier. The only real problem I have with it now, is that you pretty much have to use their IDE to develop applications with it.

So, my question is, what do you think of Qt?
Qt Libraries

inp(),outp()

jaskaran.nagra — Sat, 21 Nov 2009 14:19:32 GMT

Hi!
I am an engineering student.I was exploring the conio.h file in c++ when i encountered inp(),outp() functions. I understood the basics about them but i am still not able to create a meaningful program with it.Somebody please help me !

0xC0000005 Error on Array

zephy2 — Sat, 21 Nov 2009 13:47:16 GMT

Hello everyone,

I have used the Vector2 Class which is implemented by my asst. ,
and I encountered a problem with initializing it.

VS2008 kept saying I violate 0xC0000005 Error, and I counldn't find any reason for this.

Is there anyone who can tell me what mistakes I have made?

Thank you.

Hong

Vector2 m_pVec2Stage[150];

/*

...

*/



for(int n = 0; n<150; n++)

       m_pVec2Stage[n] = Vector2(0,0);







/*

...

*/



template 

Vector2 &Vector2::set (const Vector2 &d) {

        x = d[0];

        y = d[1];

        return (*this);

}

Qt Media Player

pymatio — Sat, 21 Nov 2009 13:21:52 GMT

I'm creating a media player with Qt & the phonon module:

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include 

#include 

#include 

#include 



void MainWindow::slotFinished(){

    int index = sources.indexOf(mediaObject->currentSource()) + 1;

    mediaObject->enqueue(sources.at(index));

    setLabelNowPlaying();

}



std::string ExtractFilename( const std::string& path )

{

  return path.substr( path.find_last_of( '/' ) +1 );

}





void MainWindow::setLabel(const QString &s){

    ui->label->setText(s);

    //qDebug() << "s = " << s;



}



void MainWindow::setLabelNowPlaying(){

    std::string stds;

    stds = "Now playing: ";

    std::string filename;

    filename = mediaObject->currentSource().fileName().toStdString();



    std::string file;



    file = ExtractFilename(filename);



    stds += file;

    setLabel( QString::fromStdString( stds ) );

}



void MainWindow::loadfromfile(std::string filename){

    try{

         std::ifstream file(filename.c_str());

         if (file.is_open()){

             char str[2000];

             bool firsttime = true;

             int index;

             while(!file.eof()){

                file.getline(str,2000);

                if (firsttime){

                    index = atoi(str);

                    if (index == -1){

                        std::cout << "ahh\n";

                        return;

                    }

                    firsttime = false;

                }else{

                    Phonon::MediaSource source(str);

                    sources.append(source);

                    std::cout << str << "\n";

                }

             }

             if (!firsttime){

                mediaObject->setCurrentSource(sources.at(index));

            }

        }

     }catch (int a){}

}



void MainWindow::saveToFile(std::string filename){

    std::ofstream file(filename.c_str());

    file << sources.indexOf(mediaObject->currentSource()) << "\n";

    foreach(Phonon::MediaSource s, sources){

        file << s.fileName().toStdString() << "\n";

    }

}



MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent), ui(new Ui::MainWindow)

{

     audioOutput = new Phonon::AudioOutput(Phonon::MusicCategory, this);

     mediaObject = new Phonon::MediaObject(this);

     metaInformationResolver = new Phonon::MediaObject(this);

     Phonon::createPath(mediaObject, audioOutput);

     connect(mediaObject, SIGNAL(aboutToFinish()), SLOT(slotFinished()));



     std::string home = getenv("HOME");

     home += "/.mped/default.session";

     std::cout << home << "\n";



     try{

        loadfromfile(home);

     }catch (int a){

     }



     ui->setupUi(this);

     statusBar()->showMessage("Imported default.session",7000);



}



void MainWindow::playPause()

{

    switch (mediaObject->state()){

        case Phonon::PlayingState:

            mediaObject->pause();

            ui->pushButtonPlay->setChecked(false);

            setLabel("Paused");

            break;

        case Phonon::PausedState:

            mediaObject->play();

            setLabelNowPlaying();

            break;

        case Phonon::StoppedState:

            mediaObject->play();

            setLabelNowPlaying();

            break;

        case Phonon::LoadingState:

            ui->pushButtonPlay->setChecked(false);

            setLabel("Paused");

            break;

    }

}



void MainWindow::addFiles()

{

    QStringList files = QFileDialog::getOpenFileNames(this, tr("Select Music Files"),

        QDesktopServices::storageLocation(QDesktopServices::MusicLocation));



    ui->pushButtonPlay->setChecked(false);

    if (files.isEmpty())

        return;

    int index = sources.size();

    foreach (QString string, files) {

            Phonon::MediaSource source(string);

            sources.append(source);

    }

    if (!sources.isEmpty()){

        metaInformationResolver->setCurrentSource(sources.at(0));

        mediaObject->setCurrentSource(metaInformationResolver->currentSource());



    }

}





void MainWindow::nextFile()

{



    int index = sources.indexOf(mediaObject->currentSource()) + 1;



    if (sources.size() > index) {

         mediaObject->stop();

         mediaObject->setCurrentSource(sources.at(index));

         mediaObject->play();

         setLabelNowPlaying();

     }

}



void MainWindow::lastFile(){

    int index = sources.indexOf(mediaObject->currentSource()) - 1;



    mediaObject->stop();

    try{

    mediaObject->setCurrentSource(sources.at(index));

    }catch(int e){}

    mediaObject->play();

    setLabelNowPlaying();

}



void MainWindow::shuffle(){

    mediaObject->stop();

    std::random_shuffle(sources.begin(), sources.end());

    mediaObject->setCurrentSource(sources.at(0));

    setLabel("Paused");

 }



void MainWindow::clear(){

    mediaObject->stop();

    sources.clear();

    setLabel("Paused");

}



void MainWindow::first(){

    mediaObject->stop();

    mediaObject->setCurrentSource(sources.at(0));

    mediaObject->play();

    setLabelNowPlaying();

}



void MainWindow::open(){

    QString filename = QFileDialog::getOpenFileName(this, tr("Select session file"),

        QDesktopServices::storageLocation(QDesktopServices::MusicLocation));

    if (filename == "" || filename == NULL){

        return;

    }

     loadfromfile(filename.toStdString());

     mediaObject->setCurrentSource(sources.at(0));

}



void MainWindow::save(){

    QString filename = QFileDialog::getOpenFileName(this, tr("Select session file"),

        QDesktopServices::storageLocation(QDesktopServices::MusicLocation));

    if (filename == "" || filename == NULL){

        return;

    }

    saveToFile(filename.toStdString());

}



void MainWindow::about(){

    QMessageBox::about(this,"About MPED",

                "MPED 0.1\n\n"

                "MPED was written by Matthew Hall \n\n"

                "MPED is release under the GPL.\n");



}



void MainWindow::aboutToFinish()

{



    int index = sources.indexOf(mediaObject->currentSource()) + 1;



     if (sources.size() > index) {

         mediaObject->enqueue(sources.at(index));

     } else {

         ui->pushButtonPlay->setChecked(false);

     }



}



void MainWindow::finished()

{



         ui->pushButtonPlay->setChecked(false);

         setLabel("Paused");



}







MainWindow::~MainWindow()

{

    std::string home = getenv("HOME");

    home += "/.mped/default.session";

    std::ofstream file(home.c_str());

    file << sources.indexOf(mediaObject->currentSource()) << "\n";

    foreach(Phonon::MediaSource s, sources){

        file << s.fileName().toStdString() << "\n";

    }

    delete ui;

}

when run if you press the next button twice it stays on the same track, also it sometimes jumps to tracks along, why?

Protecting code from decompilation

dchunt — Sat, 21 Nov 2009 11:55:05 GMT

Is there any language or way to write a program that is about 10000 lines in such a way that it can't be re-engineered by decompiling it ? What options are available to pursue ?

Thank you for your time..

Hello Everyone

FanatiK — Sat, 21 Nov 2009 11:36:40 GMT

Hi, my name is Jonathan. I am 20 years old and I have just started getting into programming in the C++ language (you must get this alot). I do know a couple of programming languages already.

Now before I waste your time let me just say that there is no question in this post. The purpose of this thread is mainly just for me to introduce myself, explain why I am here and give you a brief introduction of my programming goals.

These are the reasons I want to learn C++:

First off, is the ability to create programs that run independently from an Operating System. I am in the process of creating my own boot disk to handle tasks that I commonly have to do before I do Windows installations for "fixing" computers. Also I am interested in creating a Windows-based service for a networking program idea I have. That and, well I have been wanting to learn this language for years now lol ;)

I am going to be working on some pretty interesting program ideas. Most of my program ideas do not currently exist and I think one of them has the potential to completely change the way personal computers are used on a home network (only if mass-distributed of course). Another program idea I have could save hours when formatting/reinstalling Windows on a computer by backing up things like personal settings, product keys, files/documents, activation information, drivers and maybe even full-fledged programs. I think you can understand how C++ could help me.

I am a very independent learner so you will not have to worry about me too much. That isn't to say that I won't accept help. If anybody at any time is interested in co-developing any one of my programs I am more than happy to accept. Also, feel free to ask questions about any of my ideas.

Thank you for reading, and I hope your day turns out as awesome as mine was. =D

how to include mhash library in turbo c++

SDPRIYA — Sat, 21 Nov 2009 11:32:15 GMT

i have downloaded mhah library and i tried to include it in turbo c++ i copied the folder to the turbo c++ when i tried to run the c files in the library i found 5 errors
cant able to include mutils/mincludes.h... mutils/mtypes.h... mutils/global.h... mutils/mhash.h... libdefs.h
mutils folder is found inside include folder the mhash library .. what should i do to include these files..

Need C++ code

ihtesham4deni — Sat, 21 Nov 2009 11:16:30 GMT

Problem Statement: File Handling in C/C++
On the basis of the given scenario create a file Expenses.txt, Open the file and copy into another Expenses2.txt, Also show output on screen
A college has announced the total budget of 50,000Rs.for each game. Games are done four times in a year. Take expenses as an input from user.
Calculate the average expenses for a game:

1. If the expenses greater than 80% show as” Very Expensive”.
2. If the expenses are greater than 60% and less than 80% than show “Expensive ”
3. If the expenses are greater than 50% and less than 60% than show “Less Expensive ”
4. If the expenses are greater than 40% and less than 50% than show “Not Costly”.
5. If the expenses are less than 40% than show “Best”.

Generalized matrix inverse method for balancing chemical equation and their stability

rahul.nutron — Sat, 21 Nov 2009 09:27:24 GMT

Hi,
Its my first project. I have to develop a c program which can balance a chemical equation by the method of 'Generalized matrix inverse method for balancing chemical equation and their stability'.
But I am using a little different method. where I am not able to find complete step to find rank of a matrix. I don't be able to develop the algorithm for that.

Main Qus:
starting from a normal matrix how I can make its a part(few columns) a unit matrix by just Adding & Subtracting Rows of that matrix.
Example:
main matrix:
1 0 0 -1 0 1 0 0 0
2 1 1 -3 0 0 1 0 0
0 1 2 -1-1 0 0 1 0
0 1 0 0-1 0 0 0 1

After operation:(r2-2r1;r3-r2;r4-r2;r2-r3;r4+r3;r1+r4;r2+r4)
1 0 0 0 -2 5 -2 1 1
0 1 0 0 -1 0 0 0 1
0 0 1 0 -1 2 -1 1 0
0 0 0 1 -2 4 -2 1 1
please help me as soon as possible....Rahul

Countdown Timer Forms

evilguyme — Sat, 21 Nov 2009 09:12:51 GMT

hey

just wondering how i can make a countdown timer in a windows forms app

or just how to display an updating value onto the form.

wanted to make a countdown for number of seconds the user inputs.

thnx.

[Linker error] undefined reference to...

bamcclur — Sat, 21 Nov 2009 08:08:45 GMT

////////////////////////

/////counter.h file/////

////////////////////////

#ifndef _COUNTER_H

#define _COUNTER_H

class Counter{



    private:

       int counter;

       int limit;

       static int nCounters;

    public:

        Counter(int arg, int arg);

        void increment();

        void decrement();

        int getValue();

        static int getNCounters();

};

#include "counter.cpp"

#endif



//////////////////////////

/////counter.cpp file/////

//////////////////////////

#include 

#include "counter.h"



Counter::Counter(int a, int b){

   counter=a;

   limit=b;

   if (&nCounters==NULL){

   nCounters=0;

   }  

   nCounters++;

}



void Counter::increment()

{

    if (counter


 }

void Counter::decrement()

{

  if(counter>0) counter--;

}



int Counter::getValue(){

return counter;

}



int Counter::getNCounters(){

int dummy=nCounters;

return dummy;

}

I'm getting a linker error every time I try to access nCounters.
so i get this result when compiling:
[Linker error] undefined reference to `Counter::nCounters'
[Linker error] undefined reference to `Counter::nCounters'
[Linker error] undefined reference to `Counter::nCounters'
ld returned 1 exit status

can anybody help me with this problem?

bestnone — Sat, 21 Nov 2009 06:24:39 GMT

i keeps getting error i going to break my head to solve this problem =.=

what i am doing is using the a[3][3] to minus 128 but seem i get the problem in minus

#include 

#include 

#include 

#include 

using namespace std;



double shifted_block(double array[3][3]);





int main ()

        {

                

// input number in 3X3 array

                

        double a[3][3];

        

        double zero_zero;

        *(a+0)[0] = zero_zero;

        double zero_one;

        *(a+0)[1] = zero_one;

        double zero_two;

        *(a+0)[2] = zero_two;

        

        cout << "Enter 1st row" << endl;

        cin >> zero_zero >> zero_one >> zero_two;

        

        

        double  one_zero;

        *(a+1)[0] = one_zero;

        double one_one;

        *(a+1)[1] = one_one;

        double one_two;

        *(a+1)[2] = one_two;

        

        cout << "Enter 2nd row" << endl;

        cin >> one_zero >> one_one >> one_two;

        

        

        double two_zero;

        *(a+2)[0] = two_zero;

        double two_one;

        *(a+2)[1] = two_one;

        double two_two;

        *(a+2)[2] = two_two;

        

        cout << "enter 3nd row" << endl;

        cin >> two_zero >> two_one >> two_two;

        

        

        cout << zero_zero << " " << zero_one << " " << zero_two << " " << endl;

        cout << one_zero  << " " << one_one  << " " << one_two  << " " << endl;

        cout << two_zero << " " << two_one << " " << two_two << " " << endl;



//display out



        

                                

        cout << shifted_block(zero_zero) << endl;

        

        

        

        return 0;

                

        }



// to minus 128 of the value input

                

double shifted_block(double array[3][3])

{

        

                

        for (int countrow = 0; countrow < 3; countrow++) {

                

    for (int countcolumn = 0; countcolumn < 3; countcolumn++){

            

    return array[countrow][countcolumn] = array[countrow][countcolumn] - 128;

         

                

    }

    

}











}

pthread_create call fell into a black hole

johndoe444 — Sat, 21 Nov 2009 06:12:18 GMT

Hi,

The problem I am facing is that I don't understand the code mentioned in the following:

25: /******** this is the main thread's code */

26: int main(int argc, char *argv[])

27: {

28:   int i;

29:   int retvals[NTHREADS];

30: 

31:   /* init retvals */

32:   for (i=0; i
33: 

34:   /* do it */

35:   pt_fork(NTHREADS,    /* # of threads to create                */

36:           hola,        /* routine they execute                  */

37:           retvals,     /* a piece of global data they all share */

38:           NULL);       /* ignore exit codes                     */

39: 

40:   /* check return values */

41:   for (i=0; i
42:     if (retvals[i]!=i) {

43:       fprintf(stderr,"thread %d didn't return a value\n",i);

44:       exit(1);

45:     }

46:   return(0);

47: }

The pt_fork's source is given as:

[http://math.arizona.edu/~swig/docume...pthreads/pt.h]

extern void _pt_fork(int nthreads,

                     pt_startroutine_t start,

                     pt_addr_t arg,

                     pt_addr_t *exitcodes);



#define pt_fork(nt,start,arg,codes) \

  _pt_fork(nt,(pt_startroutine_t) start, \

           (pt_addr_t) arg,(pt_addr_t *) codes)

As can be seen from the "pt.h", the function body of _pt_fork is empty. I am not convinced where the pthread_create is being called from within _pt_fork. Ultimately, threads must be created by calling pthread_create. But the main function above calls the pt_fork(), and the call to pthread_create seems to go into a black hole defined by pt_fork.

Thanks.

I can't understand.

zemly — Sat, 21 Nov 2009 05:59:28 GMT

Plz help me. I am unable to understand this problem statement. Can Plz someone help me?

Problem Statement: File Handling in C/C++
On the basis of the given scenario create a file Expenses.txt, Open the file and copy into another Expenses2.txt, Also show output on screen
A college has announced the total budget of 50,000Rs.for each game. Games are done four times in a year. Take expenses as an input from user.
Calculate the average expenses for a game:

1. If the expenses greater than 80% show as” Very Expensive”.
2. If the expenses are greater than 60% and less than 80% than show “Expensive ”
3. If the expenses are greater than 50% and less than 60% than show “Less Expensive ”
4. If the expenses are greater than 40% and less than 50% than show “Not Costly”.
5. If the expenses are less than 40% than show “Best”.

DirectX 9 Help Needed.

tomtetlaw — Sat, 21 Nov 2009 04:59:31 GMT

How do I load 3D meshes from a .x file, and extract the material data from it? Also, how do I apply a texture to the loaded mesh?

Check each input integer digit by digit

drake2212 — Sat, 21 Nov 2009 04:57:03 GMT

I am having an issue. I need to check whether the user enters a digit greater than 0. If so the user needs to be reprompted. If 23409932 is entered then the 0 entered should be caught and the proper messaage displayed. Here is my code and please somebody help.

int userInput (int numberInput)

{
int index;
int remains;

cout << endl;
cout << " Enter a positive number count: ";
cin >> numberInput;

while (numberInput > 0) {
index = numberInput % 10;

if (index == 0) {
cout << " Error! Enter a positive number count: ";
cin >> numberInput;
numberInput = numberInput / 10;
}
else {
return numberInput;
}
}

Function problems

rafta — Sat, 21 Nov 2009 04:21:49 GMT

In this code I want to have a function to show average of movies saw by students, how to define and declare and call it in this program:

#include 

#include 



using namespace std;



/****************Function Prototypes******************/



void displayList(int [], int);         //function to display array



void getAverage (int [], int);        

void getMedian (int [] , int);

int getMode (int [], int);





/***************main***********************/



int main()

{

   int *movies, 

        total = 0, 

        average,

        numDays,

        count,

        numStudent;                                        // desired size of the array 'students'

        int* students = NULL;        // pointer to an int, initially to nothing

                

        cout << "  *** Student Movie Analysis ***\n\n";

        

        cout << "Enter the number of Students: ";

        cin >> numStudent;



        // ** Dynamic allocation of Array size 'n' **

        students = new int[numStudent];        // Allocate 'numStudent' ints and save in ptr 'students'



        for (int i=0; i
    {

                students[i] = 0;                // initialize all elements to zero

        }

  Get the number of movies from the user

    cout<<"Enter the num. of movies  below.\n";

   

     for (count = 0; count < numStudent; count++)

     {

     cout << "Student # " << (count + 1) << " : ";

     cin >> students[count];

     }



   //Calculate the total movies

      for (count = 0; count < numStudent; count++)

          {

          total += students[count];

          }

//Calculate the average movies per month

             

             average = total / numStudent;  

     

//Display the results



cout << "\n\nTotal Movies: " << total << endl;

cout << "Average : "<< average << endl; */



delete [] students;        // When done, free memory pointed to by 'students'

        students = NULL;        // Clear 'students' to prevent invalid memory reference

        

        cout << "End of Program.\n";

   system("PAUSE");

        return 0;

}

here is my average Function but it shows overloading error why i dont know

void getAverage( int list[], int numStudent)

{

      for (count = 0; count < numStudent; count++)

          {

          total += students[count];

          }

     // Calculate the average movies in a month

             

             average = total / numStudent;

how to call it @ main

Insertion Sort Issues

Jalwes — Sat, 21 Nov 2009 02:41:53 GMT

Hi all,

I'm having a heck of a time with our latest assignment. I've tried everything I can possibly think if to make this work, but with no luck. We need to Load an inventory text file, sort it, search it(haven't even got to that portion of the code). I can't seem to get my insertion sort to work properly. I can get it to sort the item number, which is an int array named items. I cannot get it to sort the corresponding item names though. Also, for some reason when it loads the text file, it prints out the last line of the file twice. Anyone who is willing to look at the code, I would very much appreciate it. Thanks.

#include 

#include 

#include 

#include 

using namespace std;



int load (char filename[], int items[], string names[], int& n);

int add(char filename[], int items[], string names[], int& n);

void sort(int items[], string names[], int n);

const int SIZE = 500;

int main(int argc, char *argv[])

{

    

    char filename[20], answer = 'n';

    int items[SIZE];

    string names[SIZE];

    int selection, n = 0;

    

    cout << "Enter a filename to load: ";

    cin >> filename;

    

    do {

       cout << "----INVENTORY MENU----" << endl << endl;

       cout << "1.  Load Inventory"<< endl;

       cout << "2.  Add to Inventory" << endl;

       cout << "3.  Search Inventory" << endl;

    

       cin >> selection;

    

    

    

       if (selection == 1) {

          load(filename, items, names, n);

          cout <<"There are " << n << " items in " << filename << "." << endl;

          } 

       if (selection == 2) {

          add(filename, items, names, n);

          }

          

       cout << "Would you like to make another menu selection? [Y/N] ";

       cin >> answer;

          

    }while(answer == 'y' || answer == 'Y');

    

    system("PAUSE");

    return EXIT_SUCCESS;

}



int load(char filename[], int items[], string names[], int& n) {

    ifstream in_stream;

    in_stream.open(filename);

    string data;

    n = 0;

    char next_symbol, number[15];

    

    do {

        int i = 0;

        do {

            in_stream.get(next_symbol);

            number[i] = next_symbol;

            i++;

        } while (next_symbol != ' ');

        items[n] = atoi(number);

            

        getline(in_stream, data);

        cout << data << endl;

        if ( data != "") {

          names[n] = data;

         

          }

         cout << endl << items[n];

         n++;

         

         

    } while (! in_stream.eof());

        

    in_stream.close();

}



int add(char filename[], int items[], string names[], int& n){

    ofstream out_stream(filename, ios::app);

   

    cout << "Enter an item number: ";

    cin >> items[n];

    cout << "Enter an item name: ";

    cin >> names[n];

    cout << endl << "Load section n is " << n << endl;

    out_stream << items[n] << setw(15) << names[n] << endl;

    out_stream.close();

    sort(items, names, n);

}

      

void sort(int items[], string names[], int n){



cout << "BEFORE THE SWAP" << endl;

for (int i = 0; i 
        cout << items[i] << setw(15) << names[i]<< endl;

        }



int key,i;



for(int j=1;j


key=items[j];

i=j-1;



      while(items[i]>key && i>=0) {

          items[i+1]=items[i];

          names[i+1]=names[i];

          i--;

      }

      items[i+1]=key;

}

cout << "AFTER THE SWAP" << endl;



for (int i = 0; i <= n; i++) {

        cout << items[i] << setw(15) << names[i]<< endl;

        }

return;

}

DHTMLDialog Interaction VC++ 2008

Tales — Sat, 21 Nov 2009 01:20:15 GMT

I built a Visual Studio 2008 VC++ project, dialog based using HTML.
In my HTML I have:



    Choose the file which contains the information:

The user is supposed to browse to a valid Excel file which I will work using the excellent ExcelFormat library by Martin Fuchs to produce a XML output.
So, I try to capture the path to the file or at least something using the button loadExcel that will trigger a function:

BEGIN_DHTML_EVENT_MAP(CGeneraliDMDlg)

        DHTML_EVENT_ONCLICK(_T("ButtonOK"), OnButtonOK)

        DHTML_EVENT_ONCLICK(_T("ButtonCancel"), OnButtonCancel)

        DHTML_EVENT_ONCLICK(_T("loadExcelButton"), OnLoadExcel)

END_DHTML_EVENT_MAP()

And here is the code to my function so far:

HRESULT CGeneraliDMDlg::OnLoadExcel(IHTMLElement* pElement){

        BSTR bstrText = NULL;

        GetElement(_T("myFileInput"), &pElement);

        if(pElement){

                pElement->get_innerText(&bstrText);

                char *Text = _com_util::ConvertBSTRToString(bstrText);

                AfxMessageBox(Text);

        }

        return S_OK;

}

For some reason I don't understand, the Message box is empty, does it mean I'm not capturing anything? can someone give me a little help with this?
To tell the truth, I found the code for the OnLoadExcel function doing some research, but it does not work.
If I do something like

pElement->put_outerHTML(blah)

, it works perfect, so i think somehow i'm loosing my information in the way.

In advance, thanks for any help you can give me :D

getline with for a string with two letters?

Deadmon — Sat, 21 Nov 2009 00:37:07 GMT

Hello all,
I'm trying to parse a file, but for some reason, getline is combining my two letter words with other words.

Here is the portion of code I'm working with: note: my program will always ignore the first word in a line

char line[256];

string word;  

char *line2=new char(); 

        fgets(line, 256, in); //get the line from the in stream (which contains the file)

        if (feof(in))

         return;

        printf("%s",line); //print first line

        strncpy(line2,line,(strlen(line)-1)); //copy the line into a char pointer, minus the newline char

        string str;

str.assign(line2); //copy the line2 char* into a string, this maybe be redundent



stringstream s(str); //set s as a sstream reading from the str

getline(s, word, ' '); //gets the first word, which I do not use

while (getline(s, word, ' ')){ //gets the following words in the line in order and parses

cout<<"word is " << word << endl;



//pseudo code here where if the current parsed word is recognized, then the program prints something, otherwise it will recurse to the next line, not really important here

}

For example, say in my file I have
pet CAT AB

When I use my cout to check my parsed words, I would see CAT, then ABCAT. Any reason why? Thanks.

Not sure if my "for" statment code is correct.....

confusedndazed — Fri, 20 Nov 2009 23:23:33 GMT

My question:
What is the output of the code corresponding to the following pseudocode?

Set y = 0

For (i = 0; i<=6; i=i+3)

For (j = 0; j<=15; j=j+5)

Set y = y + 1;

End For (j)

End For (i)

Output y

This is what I have so far but I'm not sure if it's right/complete:

#include 



int main()

{

int y = 0;

for(int i = 0; i <= 6; i+= 3)

for(int j = 0; j<= 15; j+=5)

++y;



std::cout << y << "\n";

}

Thanks in advance!!!

Bubble and Selection sort

rafta — Fri, 20 Nov 2009 23:08:56 GMT

here is my codes
basicallysorting works
but now i have to set a counter to display out the contents of array1 and array2 each pass of the sort. the problem is where to put that counter????

#include 

#include 



using namespace std;

// Function prototypes

void showArray1(int [], int);

void bubbleSortArray1(int [], int);

void showArray2(int [], int);

void selectionSortArray2(int [], int);



 int main()

 {

 const int SIZE = 8;  //size of the arrays

 //two identical arrays of 8 integers 

 

 int array1[SIZE] = {7, 2, 3, 8, 9, 1, 5, 4};

 int array2[SIZE] = {1, 5, 7, 8, 9, 3, 2, 0};  //??

 

 //display First array

 cout << "The unsorted values in array1 are:\n";

showArray1(array1, SIZE);

  

 //*call the function to sort array 1[ Binary sort]

bubbleSortArray1(array1, SIZE);

cout << "The Bubble sorted values of array1 are:\n";

showArray1(array1, SIZE);

  

 //display second array

 cout << "The unsorted values in array2 are:\n";



 showArray2(array2, SIZE);

 

//call the function to selection sort array2 in ascending order

 

selectionSortArray2(array2, SIZE);

cout << "The Selection sorted values of array2 are:\n";



showArray2(array2, SIZE);



 cout << "End of Program.\n";

   system("PAUSE");

        return 0;

}

/**********Function to display array1***************/

void showArray1(int array1[], int elems)

{

for (int count = 0; count < elems; count++)

cout << array1[count] << " ";

cout << endl;

}

  /**********Function to display array2***************/

void showArray2(int array2[], int elems)

{

     for (int count = 0; count < elems; count++)

         cout << array2[count] << " ";

         cout << endl;

}

//**********Function to BUBBLE sort array1***************/

//***********Modified to print elements position after each pass*****/

/***********************************************************

This function performs an ascending-order bubble sort on *

 array1. The parameter elems holds the number of elements *

in the array. *

***********************************************************/

void bubbleSortArray1(int array[], int elems)

{

          int temp;

          bool swap;

     do

     { swap = false;

            for (int count = 0; count < (elems - 1); count++)

            {

               if (array[count] > array[count + 1])

                  {

                    temp = array[count];

                    array[count] = array[count + 1];

                    array[count + 1] = temp;

                    swap = true;

                    }

 

            }

     } while (swap);

} 

//**********Function to selection sort array2***************/

//***********Modified to print elements position after each pass*****/

void selectionSortArray2(int array[], int elems)

{

     int startScan, minIndex, minValue;



      for (startScan = 0; startScan < (elems - 1); startScan++)

      {

          minIndex = startScan;

          minValue = array[startScan];

             for (int index = startScan + 1; index < elems; index++)

                 {

                 if (array[index] < minValue)

                    {

                     minValue = array[index];

                     minIndex = index;

                     }

                  }

          array[minIndex] = array[startScan];

          array[startScan] = minValue;

       }

}

structs and functions

plobby — Fri, 20 Nov 2009 22:34:43 GMT

I am working on some homework right now and the program has to return two specified values depending on the key value the user enters. I only had to write the bottom portion of the program as the top portion was given to me as a shell.

It runs but is not returning the correct values, can anyone give me any insight as to why it is not returning the correct vaues? I am not sure if I am understanding completely how structs pass values and such...

Thanks

#include 



// Definition of the PhoneTones struct



struct PhoneTones

{

   int rowTone,   // Frequencies of the tones generated by a key press

       colTone;

};



// Function prototype



PhoneTones keyToTones ( char key );



//--------------------------------------------------------------------



int main()

{

    char inputKey;         // Input key

    PhoneTones keyFreqs;   // Frequencies of the corresponding tones



    // Read in a series of keys and output the corresponding tones.



    cout << endl << "Enter key pressed (0-9, *, or #): ";

    cin >> inputKey;

    keyFreqs = keyToTones(inputKey);

    cout << "Tones produced at " << keyFreqs.rowTone << " and "

         << keyFreqs.colTone << " Hz" << endl;

    system("pause");

        return 0;

}



//--------------------------------------------------------------------

// Insert your keyToTones function here.

//--------------------------------------------------------------------



PhoneTones keyToTones ( char key )

{

    PhoneTones Freqs;



    switch (key)

    {

      case '1': case '2': case '3': Freqs.rowTone = 697; break;

      case '4': case '5': case '6': Freqs.rowTone = 770; break;

      case '7': case '8': case '9': Freqs.rowTone = 852; break;

      case '*': case '0': case '#': Freqs.rowTone = 941; break;

    }

    

    switch (key)

    {

    case '1': case '4': case '7': case '*': Freqs.colTone = 1209; break;

    case '2': case '5': case '8': case '0': Freqs.colTone = 1336; break;

    case '3': case '6': case '9': case '#': Freqs.colTone = 1477; break;

    }

}

Inheritance

itzaaron — Fri, 20 Nov 2009 21:13:08 GMT

Okay where should I begin.... I have this rather asinine program that as of right now only asks the user what quantity of dollars and particular coins they have then just spits out what was imputed. I need to add in a 'child' class that does all the following

-Add a new private or protected data member for a cents. This should be a floating point variable.

-Add the appropriate accessor and mutator methods to the class

-It needs to have its own no argument constructor that calls the base class constructor and then initializes cents to 0.

-The new class should override the inputInfo method of Money. This new method will use the base class method to retrieve the data from the user as dollars, quarters, dimes, nickels and pennies. After the data has been retrieved the method should convert and store the value of the dollars, quarters, dimes, nickels and pennies as a floating point value in cents.

-The new class should override the outputInfo method so that in additional to calling the base classes method, it prints an additional line showing the amount of money as a decimal value.

I attached a UML (i think)

And heres the code:

#include 

using namespace std;



class Money

{

private:

// Private data members

int dollars, quarters, dimes, nickels, pennies;

public:

// Default constructor

Money() : dollars(0),quarters(0),dimes(0),nickels(0),pennies(0)

{}

// User input/output methods

void inputInfo();

void outputInfo();

// Accessor methods

int getDollars() { return(dollars); }

int getQuarters() { return(quarters); }

int getDimes() { return(dimes); }

int getNickels() { return(nickels); }

int getPennies() { return(pennies); }

// Mutator methods

void setDollars(int data) { dollars = data; }

void setQuarters(int data) { quarters = data; }

void setDimes(int data) { dimes = data; }

void setNickels(int data) { nickels = data; }

void setPennies(int data) { pennies = data; }

};

int main()

{

Money money;

money.inputInfo ();

money.outputInfo ();

return 0;

}

void Money::outputInfo()

{

cout << "\n\nYou have " << getDollars() << " dollars, "

<< getQuarters() << " quarters, "

<< getDimes() << " dimes, " << getNickels()

<< " nickels and " << getPennies()

<< " pennies.\n";

}

void Money::inputInfo()

{

int input;

cout << "Enter the number of dollars you have (whole numbers only): ";

cin >> input;

setDollars(input);

cout << "Enter the number of quarters you have (whole numbers only): ";

cin >> input;

setQuarters(input);

cout << "Enter the number of dimes you have (whole numbers only): ";

cin >> input;

setDimes(input);

cout << "Enter the number of nickels you have (whole numbers only): ";

cin >> input;

setNickels(input);

cout << "Enter the number of pennies you have (whole numbers only): ";

cin >> input;

setPennies(input);

}

Now what I need is some help as to how to implement this new derived class into my code.

And please try to keep any explanations simple I am rather "challenged" in this field.

Attached Images

UML.png (61.1 KB)

separating left & right channels in array using libsndfile

debugdom — Fri, 20 Nov 2009 20:48:10 GMT

Hi-

I'm really new to c+ (this is day two) and I'm trying to write a program that will allow me to write audio data from a wave file into two arrays for the left channel and the right channel, i've pieced together this code so far and its definitely grabbing something from the wave file however i've no idea if its writing out left or right data or even a combination of the two.

any ideas what I could be doing wrong?

thanks

domm

int ReadWave::waveFileToArray(){

        

        //sndfile obj + soundfile info object

        SNDFILE *sf;

        

   SF_INFO info;

        

   int num;

        int num_items;



        int numFrames;

        int sampleRate;

        int channels;



        int i;

        int j;

        

   FILE *out;

        

        

        SNDFILE *outWave;

        // open the wave



        info.format = 0;

   sf = sf_open(filePath, SFM_READ,&info);

   if (sf == NULL)

       {

       printf("Failed to open the file.\n");

       exit(-1);

        }

        

        numFrames = info.frames;

   sampleRate = info.samplerate;

   channels = info.channels;

        

        num_items = numFrames * channels;





        vector  buffer(num_items);



        num = sf_read_int(sf, &buffer[0], num_items);

        sf_close(sf);







        

        for (i = 0; i < num; i += channels){

             

                        rawWaveDataArray.push_back(buffer[i]);

                        



        }



        

        printf("the array size is: %d \n", rawWaveDataArray.size());

        

   printf("frames=%d\n", numFrames);

   printf("samplerate=%d\n", sampleRate);

   printf("channels=%d\n",channels);



   printf("num_items=%d\n",num_items);

        printf("Read %d items\n", num);

        

        for(i = 0; i < rawWaveDataArray.size(); i++){

                printf("%d\n", rawWaveDataArray[i]);

        }



   fclose(out);



        return 0;

}

simulating alt+2 (keypad) combination

kangekraam — Fri, 20 Nov 2009 20:47:06 GMT

I am trying to print the corresponding Unicode character for alt+2 to the Windows console window. (the console doesn't display the character, but should display ^B instead)
The following doesn't seem to work. Just prints "2".

keybd_event(VK_MENU,0 ,0 , 0); //Alt Press

Sleep(10);
keybd_event(VK_NUMPAD2,0, 0 , 0); // 2 Press

Sleep(10);
keybd_event(VK_NUMPAD2,0, KEYEVENTF_KEYUP,0); // 2 Release

Sleep(10);
keybd_event(VK_MENU,0,KEYEVENTF_KEYUP,0); // Alt Release

Sleep(10);

Neither does this work. Again, just prints "2".

INPUT inputs = {0};
inputs.type = INPUT_KEYBOARD;

KEYBDINPUT ki = {0};
ki.wVk = VK_LMENU;

inputs.ki = ki;
SendInput(1, &inputs, sizeof(INPUT)); // Left alt

ki.wVk = VK_NUMPAD2;
inputs.ki = ki;
SendInput(1, &inputs, sizeof(INPUT)); // Numpad 2

ki.dwFlags = KEYEVENTF_KEYUP;

ki.wVk = VK_NUMPAD2;
inputs.ki = ki;
SendInput(1, &inputs, sizeof(INPUT)); // Numpad 2

ki.wVk = VK_LMENU;
inputs.ki = ki;
SendInput(1, &inputs, sizeof(INPUT)); // Left alt

about this function..

maverick405 — Fri, 20 Nov 2009 20:33:24 GMT

I just want to know what does the below mentioned function means?

Create vector of strings with alphabet

wh33lz — Fri, 20 Nov 2009 20:12:47 GMT

So here is the question and it is really stumping me because I can print the alphabet once but cant figure out how to repeat it.

First create a character array that contains the 26 letters as shown here. //Easy I can copy and paste ha.

char cAlphabet[] = {'a','b','c','d','e','f',

                'g','h','i','j','k','l','m','n','o','p',

                'q','r','s','t','u','v','w','x','y','z'};

Then create a vector of strings where the first string is 'a' and the second is 'bc', the third, 'def', etc. Create the number of strings requested by the user. Once you reach the letter z, start again with first letter in the alphabet. When you are done, print each vector to the screen.

How many strings would you like to create?
8

a
bc
def
ghij
klmno
pqrstu
vwxyzab
cdefghij

Here is what I have so far it works up until 6 or 7 strings but I dont know how to fix it so that it will continue to print strings with the alphabet starting over. Anything helps, Thanks.

#include 

#include 

#include 

using namespace std;





void printVector( vector v )

{

  for(unsigned int i = 0; i < v.size(); i++)

  {

    cout << v[i] << "\t";

  }

  cout << endl;



        return;

}



int main()

{

int nStrings=0;



string str1=" ";



vector myVector;



char cAlphabet[] = {'a','b','c','d','e','f',

                'g','h','i','j','k','l','m','n','o','p',

                'q','r','s','t','u','v','w','x','y','z'};



str1=cAlphabet;

string str=" ";

str= str1.substr(0,26);

cout<


cout<<"How many strings would you like?"<
cin>>nStrings;



for(int i=0; i < nStrings; i++)

{

        static int j=0;

        j= j + i;



myVector.push_back(str.substr( j, (i+1) ));



printVector(myVector);

myVector.clear();



}





return 1;

}

[][] operator?

daviddoria — Fri, 20 Nov 2009 19:27:27 GMT

Say you have a class that has members

private:

double a,b,c,d,e,f,g,h,i;

You can make an accessor like:

  double operator[](int index)

  {

    if(index == 0)

      return a;

    else if(index == 1)

      return b;

    else if(index == 2)

      return c;

  }

But how would you do something like this:

 

  double operator[][](int rindex, int cindex)

  {

    if(rindex == 0 && cindex == 0)

      return a;

    else if(rindex == 1 && cindex == 0)

      return b;

    else if(rindex == 2 && cindex == 0)

      return c;

    else if(rindex == 0 && cindex == 1)

     return d;

..... etc ...

  }

The compiler doesn't like the above attempt. The behavior I'm looking for is:

MatrixClass Matrix;

// ... fill it

double test = Matrix[0][1];

Thoughts?

Thanks,

Dave

Algoritm Question

spiriad — Fri, 20 Nov 2009 18:19:47 GMT

Hello there,

I have the following situation : I have a moving ball in a rectangular 2D chamber. When the ball touches the walls of the chamber it changes it's direction. It is simple to implement the ball movement when the chamber is empty ( it has only 4 walls). My question is , how to I implement the movement of the ball in a chamber with numerous objects in it ? ( by objects I refer to rectangular or square shapes). Also , I know the initial ball direction. I've tried using a matrix to map the room, but I got stuck in it. Have any good ides of how could this be done ?

program does not read input

new programer — Fri, 20 Nov 2009 18:15:17 GMT

Hello all,

I did this program below, it is meant to get a student name then 5 of his/her grades sums them up in a void function and calculate the average but outputs the average from the main

the problem is that the loop goes on and prints the prompt but takes no input

how can I fix that ?

# include 

# include 

using namespace std;



void avg (int grade[]);



int main()

{

  char name;

  double average;

  int grade[5];



  cout << "Student name" <
  cin.get(name);

  cout <


  avg (grade);

  cout << "The average is " << average <


 return 0;

}



  void avg (int grade[])

  {

          double sum=0;

          double average;



          for (int i=0; i<5; i++)

          {

                  cout << "Please enter grade" <
                  cin >> grade[i];

                        sum= sum+grade[i];

                        average = sum/5;

                }

  }

store numbers from a .txt file

nunchuckie — Fri, 20 Nov 2009 15:15:38 GMT

Hi, I've just started with c++ and I have no clue how to do this. Right now I have a code that just printing out the text lines in my file and how many lines there is just to check that i can read from my file...

But what I want to do and can't figure out is to pick out and store numbers from text lines.

Consider this as user inputs to a file:

Number 10 Downing Street
My birthday is 6 May 1980

And now I want to read from the .txt file and store the number 10 from the first text line and then store 6 and 1980 from the second line of text.

//..Some codes to put in lines of user specific text to a file. [done]



//And now the code that outputs the text rows and number of rows in

//the file but have nothing to do with what i want to achive :(

  

  ifstream inputfile(filename);

  char text;

  int n = 0; 

  

  while (inputfile.get(text))

    {

      cout.put(text);

      if (text == '\n')

        ++n;

    }

  

  cout << endl << There is " << n << " rows of text";

Problems with compiling in VS10 Express Beta2

FrozenSnake — Fri, 20 Nov 2009 14:58:47 GMT

I decided to try Visual Studio 2010 express Beta 2.
This code works fine on my other computer that uses Visual Studio 2009 Pro.

I am going to make a Timer that count down from a fixed time depending on foodsource. But first this code need to work :P so I can add the rest :) I wish to get this working in VS10E because I dont use VS08 on this computer.

#include 



const char gClassName[] = "TibiaTimer";



LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)

{

        switch(msg)

        {

        case WM_CLOSE:

                DestroyWindow(hwnd);

                break;

        case WM_DESTROY:

                PostQuitMessage(0);

                break;

        default:

                return DefWindowProc(hwnd, msg, wParam, lParam);

        }

        return 0;

}



int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)

{

        WNDCLASSEX wc;

        HWND hwnd;

        MSG msg;



        wc.cbSize                        = sizeof(WNDCLASSEX);

        wc.style                        = 0;

        wc.lpfnWndProc                = WndProc;

        wc.cbClsExtra                = 0;

        wc.cbWndExtra                = 0;

        wc.hInstance                = hInstance;

        wc.hIcon                        = LoadIcon(NULL, IDI_APPLICATION);

        wc.hIconSm                        = LoadIcon(NULL, IDI_APPLICATION);

        wc.hCursor                        = LoadCursor(NULL, IDC_ARROW);

        wc.hbrBackground        = (HBRUSH)(COLOR_WINDOW+1);

        wc.lpszMenuName                = NULL;

        wc.lpszClassName        = "TibiaTimer";



        if(!RegisterClassEx(&wc))

        {

                MessageBoxA(NULL, "Window registration failed!", "FATAL ERROR", MB_ICONEXCLAMATION | MB_OK);

                return 0;

        }

        

        hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, "TibiaTimer", "TibiaTimer", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 340, 240, NULL, NULL, hInstance, NULL);

        if(hwnd == NULL)

        {

                MessageBoxA(NULL, "Window creation failed!", "FATAL ERROR", MB_ICONEXCLAMATION | MB_OK);

                return 0;

        }



        ShowWindow(hwnd, nCmdShow);

        UpdateWindow(hwnd);



        while(GetMessage(&msg, NULL, 0, 0) > 0)

        {

                TranslateMessage(&msg);

                DispatchMessage(&msg);

        }



        return msg.wParam;

}

I use char-set Use Multi-Byte Character Set and have tried Unicode as well but then I get some compiler errors. But I get a lot of Linker errors in VS10E. Here is the list for anyone that wanna take a look and maybe shed some light on this.

Quote:

I wanted to attach a zip file but I wasn't allowed :P maybe the file was to big.

Converting wav file to text format and vice versa

bkpally263 — Fri, 20 Nov 2009 14:36:35 GMT

Hey all

I need to convert audio file of wav format into text file in order to feed it as input to an encryption algorithm(IBE encrypt method of Miracl library takes only texts as input) and have to reconvert the decrypted text file to audio format.

Could you please suggest me a way to accomplish this. I have rest of my code written in C++.

regards
bk

code tags....

maverick405 — Fri, 20 Nov 2009 14:28:36 GMT

I wonder if anyone can tell me how the code tags works? As per my understanding does it works like:

#include
#include
using namespace std;

struct Shop
{
int Price;
int Amount;
};

void PrintPrice (Shop Product);
void PrintAmount (Shop Product);

int main()
{
//For Input:
Shop FI;

//Products:
Shop Apple;
Shop Banana;
Shop Orange;

//Prices:
Apple.Price = 3;
Banana.Price = 5;
Orange.Price = 7;

//Amounts:
Apple.Amount = 5;
Banana.Amount = 10;
Orange.Amount = 15;

//Programme:
cout << "Enter The Product's Name: ";
cin >> FI;

PrintPrice(FI);
PrintAmount(FI);

//End Of Programme:
getch();
return 0;
}

void PrintPrice (Shop Product)
{
cout << "The Price Is: " << Product.Price < }

void PrintAmount (Shop Product)
{
cout << "The Amount Is: " << Product.Amount;
}
I Know This Is Wrong:

cin >> FI;

so what can it be replaced by?
Hope you got it...

Even Number Program

nedsnurb — Fri, 20 Nov 2009 12:49:33 GMT

I wrote this program which takes the value from the user and makes it into a even number if the number entered was odd, if not then print out a message to say they need to enter a odd number. But the program continues to return a value from the makeEven function even though I just want it to print out the message saying enter an odd number.

I'm relatively new to C++ and just cant get my head around where it is getting the value it happens to print out.

#include 



using namespace std;



int makeEven(int x)

{ 

        if ( x % 2 != 0 ) 

                return x-1;

        else

                cout<<"Please enter an odd number!";

        goto /*line*/ 18;

}



int main()

{

        int x;



        cout << "Please enter an integer: ";

        cin >> x;

        

        cout << "Your number is now: " << makeEven(x) <
        

};

Multiple Funcs passed to text file

ab00120 — Fri, 20 Nov 2009 12:01:02 GMT

Hi there,

I am trying to make a program, as shown below. I have used a snippet with hello and bye as the program is really very big. Unfortunately I am unable to edit these functions as they are all part of a complex linked list.

I am trying to pass both functions from the class CWrite into a text file however what currently occurs is the second function overwrites the first function (i think). I have genuinly no idea what to do to solve this.

Any help fixing this would be greatly appreciated.

#inlcude 

#include 

#include 



class CWrite

{

public:

        int write(std::string name);

        int write(std::string name);

};



#include “stdafx.h”

#include “output.h”



int CWrite::write(std::string name)

{

        std::ofstream output(name.c_str());

        output<<”HELLO”<
output.close();

return 0;

}



int CWrite::write(std::string name)

{

        std::ofstream output(name.c_str());

        output<<”HELLO”<
output.close();

return 0;

}



Private: System::Void ButOut_Click(System::object^ sneder, System::eventArgs^ e)

{

        SaveFileDialog ^ saveFileDialog1 = gcnew SaveFileDialog();

        savefileDialog1->Filter = “txt files (*.txt)|*.txt|All files (*.*)|*.*”;

        saveFileDialog1->InitialDirectory = “library”;



        if(saveFileDialog1->ShowDialog() == System::Windows::Forms::DialogResult::Ok)

        {

                CWrite a;

                std::string std_name = SystemToStdString(saveFileDialog1->FileName);

                int success = a.write(std_name) + a.writeSDF(std_name);

}

Please ignore any syntax errors as the code had to be written from Word.

Thanks in advance,

Andy

Errors in my code (using arrays)

new programer — Fri, 20 Nov 2009 11:26:35 GMT

Hello everyone;

I did a program using arrays -for the first time-

I've got errors, I fixed some and there are others left that I couldn't straighten

any help is highly appreciated

here is the code :

# include 

# include 

using namespace std;



int read_car (int cars[], int n);

double read_time (double time[], int n);

double charge (time[]);

void print ();



double sum_time, sum_charge;



int main()

{

        int time;

        int cars[n];

        int n;



        cout << "Welcome to the Car Parking fee calculater." <
        cout << "Please enter the numbers of the cars." <
        cin >> n;



        read_car (cars,n);

        read_time(time,n);

        charge(time,n);



        print ();

        

        return 0;



        

}











//1



int read_car (int cars[], int n)

{

        int i;



        for (i=1; i<=n; i++)

                cin >> cars[i];



        return cars;

}



//2

double read_time (double time[], int n)

{

        int i;

        sum=0;



        for (i=1; i<=n; i++)

                cin >> time[i];

        time[i] = ceil(time);

        

        sum_time= sum + time;



        return time;

}

//3

double charge (double time[],int n)

        { 

                double charge;

                double sum=0;



                for ( int i=1; i<=n; i++)

                {



                        if (time <= 3.00)

                                charge= 2.00;



                        if (time == 24.0)

                                charge = 10.0;

        

                                else 

                                        charge = (time - 3)*0.5 + 2.00;



                        sum_charge= sum+charge;



                        return charge;

                }

}



//4

void print (n)

{

        cout << left;

        cout << setw(6) <<"Car"

                 << setw(6) <<"Hours"

                 << setw(6) <<"Charge" 

                 <
        cout <<"__________________"<


        for (i=1; i<=n; i++)

        {



                cout << setw(6) << i

                         << setw(6) << time[i]

                         << setw(6) << charge (time,n)

                         <
        }

        

        cout <<"__________________"<


        cout << setw(6) <<"Total"

                 << setw(6) << sum_time

                 << setw(6) << sum_charge

                 <


}

C++ recursive function (very simple one)

codeyy — Fri, 20 Nov 2009 08:43:52 GMT

How do I write a recursive function in C++ to display a triangle of * like this using a parameter size (e.g. 4 in the following example):

*
**
***
****

I am able to write a recursive function to display an inverted triangle like this:

****
***
**
*

The code for the inverted triangle function is:

void inverted(int a)

{

        if (a==1)

        {

                cout<<"*"<
        }

        else

        {

                for (int i=0; i
                {

                        cout<<"*";

                }

                cout<
                inverted(a-1);

        }

}

I am allowed to use a loop (e.g. for loop) to print a row of * but I must use a recursive function to control the number of rows.

Please, provide some insight into the problem. I need it to work urgently but I am not able to figure out a solution.

How To Bubble Sort

EngneerNitemare — Fri, 20 Nov 2009 07:39:30 GMT

Can someone please explain the concept behind bubble sorting a vector step by step? I know this is a tedious task so whoever answers I will much appreciate it! :)

Questions:

1.) What variables are being used?
2.) How and where is the function placed?
3.) Where and why are the for loops?
4.) Step by step procedure in example of vector bubble sort.

THANK YOU!

Revrse String

maverick405 — Fri, 20 Nov 2009 06:27:12 GMT

The code below runs fine but I want some help how can I get output of my original input and reverse of that i.e. ABCDE Z. WXYZ ---> EDCBA .Z ZYXW The below is the code for this.

 

#include 

#include 



using namespace std;

void swap(char& a, char& b)

{

  char tmp = a;

  a = b;

  b = tmp;

}

int main()

{

  char name[19] = "ABCDE Z. WXYX";

  int a = -1, b = -1;

  int nameLength = strlen(name);

                 for (int i = 0; i <= nameLength; ++i)

                     if (i == nameLength || name[i] == ' ')

                     {

                     b = i;

                 for (int j = 0; j < (b - a) / 2; ++j)

                     swap(name[j + a], name[b - j - 1]);

                     a = b + 1;

                     }

                     else

                     if (a == -1)

                     a = i;

                     cout << name <<"\n";



   system("PAUSE");

   return EXIT_SUCCESS;

}

Arrays and Strings

thebeast91 — Fri, 20 Nov 2009 06:26:11 GMT

I have been writing a program using arrays and strings.Here is my question.
A class of students takes a 20 question multiple-choice exam;each question has 5 choices(a,b,c,d,e)only one of them are correct.In "tests.dat"Each record of which consists of a student id, followed by a blank, followed by students 20 responses. In "answers.dat" which consists of a single record, namely the correct answers to the exam.Then It needs to produce a grade summary report like this.If the answer is correct it should put a "*" by the correct answer

student-id number correct
1231231212312 12
1233424325435 25
.... ..

question A B C D E
1 5 1 13* 3 1
2 4 7* 5 12 7
.
.
...

this is what i got so far.Thank you

#include 

#include 

#include 

#include 



using namespace std;

int question[20][5];

int main()

{

        ifstream fanswers, fcorrect_keys;

        

        char correct_keys[21];

        char student_id[100][12], answers[100][21];

        char id_buf[12], answers_buf[21];

        

        int student_count = 0;

        

        fcorrect_keys.open("Answers.dat");

        while(!fcorrect_keys.eof())  {                

                fcorrect_keys >> answers_buf;

                strcpy(correct_keys, answers_buf);

        }

//        cout << correct_keys << endl;

        fcorrect_keys.close();

        fanswers.open("Tests.dat");

        while(!fanswers.eof())  {                

                fanswers >> id_buf >> answers_buf;

                strcpy(student_id[student_count], id_buf);

                strcpy(answers[student_count],answers_buf);

                student_count++;                  

           }

//        for(int i=0; i < student_count;i++)

//                cout << student_id[i] << "  " << answers[i] << endl;

          fanswers.close();// close the file  

        cout << " student_id      number_correct" << endl << endl;

        for(int i = 0; i < student_count; i++)  {

                int correct_count = 0;

                for(int j = 0; j < 20; j++)  { 

                        if (answers [i][j] == correct_keys[j])

                                correct_count++;

                        question[j][answers[i][j] - 'A']++;

                }

                printf("%11.11s         %2d\n", student_id[i],correct_count);

        }        

        cout << endl << endl << endl << "Number of students taking exam : " << student_count << endl; 

        

        printf("\nquestion     A    B    C    D    E\n");

        

        for(int k = 0; k < 20 ; k++)  {

                printf("   %2d      ",1+k);

                for(int l=0;l < 5; l++)

                        printf(" %2d%c ", question[k][l], (l == (correct_keys[k] - 'A') ? '*' : ' '));

                printf("\n");

        }

        return 0;

}

DirectX 9 3D Models

tomtetlaw — Fri, 20 Nov 2009 06:19:44 GMT

How do I load 3D models that are in the .x format from DirectX 9?
I am trying to make a simple engine and this is the part where I am stuck at.

factory design or shared laibrary

tarakant_sethy — Fri, 20 Nov 2009 05:14:03 GMT

Hi,

some time back i faced question like this.
we ca use factory design using factory desing implementation. we can do the same using the shared laibrary, like we will have a static function in the shared laibrary which will be returning pointer to base class object. what is the difference between these two ?

i hope u people got my question.

Bad parameter: A bad object array

SagarSonu — Fri, 20 Nov 2009 04:19:57 GMT

Hello All,
I am creating the array of size: 26627664 bytes then convert the byte to char array.
While deleting the array i got an code gaurd log error that Bad Parameter.

I am doing like this
Char* pBuffer = (Char*)new BYTE[26627664];

and deleting like this,
if(pBuffer != NULL)
delete[] pBuffer;
facing the problem
Please Help.

Help!!!!!

KRal — Fri, 20 Nov 2009 03:01:28 GMT

// I am new to C++ and can not seem to get the falling man to output to the screen. Any help would be greatly appreciated.

    #include 

    #include 

    using namespace std;

     

    void DrawBar(char guess);

        

    int main()

    {

        char solution[8]; //holds solution

        char blank[8]; //holds "*"'s for unsolved letters

        int counter = 0; //general-use counter

        int right = 0; //1 = right guess, 0 = wrong guess.

        char guess;

       

        cout<<"Enter phrase 8 chars or less."<
        cin.getline(solution, 8);

        int puzzLength = strlen(solution); //finds lengtrh of puzzle, stores INT value to puzzlength

         

    //convert puzzle to full uppercase

    for (counter = 0; counter < puzzLength; counter++){

       solution[counter] = toupper(solution[counter]);

    }

    //done converting

      

    strcpy_s(blank, solution); //copy solution to the 'blank' array

      

    for (counter = 0; counter < puzzLength; counter++) { //converts characters to _'s to represent blanks

      

       if (isalnum(solution[counter])) blank[counter] = '_';

 

       else blank[counter] = solution[counter];

        

    } //closes for loop

        

    while (strcmp(solution, blank)) { //play game until the 'blank' puzzle becomes the 'right' answer

       

    cout<
    cout<<"The current 'blank' puzzle is: "<
    cout<<"Enter a guess."<
    cin>>guess;

    guess = toupper(guess);

         

       

    //cbeck guess!

    for (counter = 0; counter <= puzzLength; counter++) {

        

        if (guess == solution[counter]) {

        blank[counter] = guess; //fill in the puzzle with the letter

         

        }

         

        } //close loop, done checking guess

         

        } //game is over.

         

        cout<<"Winner!";

        cin.get();

        return 0;

       }

           

//DrawBar(guess);        //Draw the hanging bar at end of game

        //They lost if they are here so tell them the answer.

        //cout<<"The word was : "<






// This will Draw the hanging bar according to the state

void DrawBar(char guess)

{

        

        if(guess==5)

        {

                cout<
                        <<"   +--------+  "<
                        <<"   |    0      "<
                        <<"   |   /|\\     "<
                        <<"   |   / \\    "<
                        <<"   |           "<
                        <<"   | AAHHH!!!  "<
                        <<"  ============"<
                

                Sleep(500); // Message Sleep for 1 second

                

        cout<
                        <<"   +--------+  "<
                        <<"   |           "<
                        <<"   |    0     "<
                        <<"   |   /|\\   "<
                        <<"   |   / \\    "<
                        <<"   | AAHHH!!!  "<
                        <<"  ============"<


                Sleep(500); // Message Sleep for 1 second

    

                cout<
                        <<"   +--------+  "<
                        <<"   |           "<
                        <<"   |          "<
                        <<"   |   0        "<
                        <<"   |  /|\\      "<
                        <<"   | AAHHH!!!  "<
                        <<"  ============"<


                Sleep(500); // Message Sleep for 1 second



                cout<
                        <<"   +--------+  "<
                        <<"   |           "<
                        <<"   |          "<
                        <<"   |           "<
                        <<"   |   0       "<
                        <<"   | AAHHH!!!  "<
                        <<"  ============"<


                Sleep(500); // Message Sleep for 1 second



                cout<
                        <<"   +--------+  "<
                        <<"   |           "<
                        <<"   |          "<
                        <<"   |           "<
                        <<"   |           "<
                        <<"   | AAHHH!!!  "<
                        <<"  ============"<


        }

        else if(guess==4)

        {

                cout<
                        <<"   +---------+  "<
                        <<"   |    \\0     "<
                        <<"   |     |\\    "<
                        <<"   |    / \\    "<
                        <<"   |            "<
                        <<"   |            "<
                        <<"  ============="<
        }

        else if(guess==3)

        {

                cout<
                        <<"   +----------+  "<
                        <<"   |    \\0/     "<
                        <<"   |     |       "<
                        <<"   |    / \\     "<
                        <<"   |             "<
                        <<"   |             "<
                        <<"  ============="<
        }

        else if(guess==2)

        {

                cout<
                        <<"   +-----------+  "<
                        <<"   |  0_:__:      "<
                        <<"   |       \\     "<
                        <<"   |              "<
                        <<"   |              "<
                        <<"   |              "<
                        <<"  ============="<
        }

        else if(guess==1)

        {

                cout<
                        <<"   +-----------+  "<
                        <<"   |  0_:__:     "<
                        <<"   |              "<
                        <<"   |              "<
                        <<"   |              "<
                        <<"   |              "<
                        <<"  ============="<
        }



}

Segmentation fault. help plz!

bigmaq — Fri, 20 Nov 2009 01:45:50 GMT

So i need help figurin out where my segmentation fault is comin from. Im not even close to finishing this program but i was just testing my progress so far to make sure that it was taking values correctly, but sometimes the program doesnt stop when its supposed to and when it does i get a segmentation fault at the end, even if it works the way i want it to.

heres the code:

#include

using namespace std;



class Heapsort

{

  private:

     int mylist[];

     int mysize;

  public:

     void get_size();

     bool empty();

     void sort();

     void fill_array();

     void print(int);

};





void Heapsort::get_size()

{

   cout <
   cin >> mysize;

   int mylist[mysize];

}



void Heapsort::fill_array()

{

    int i;

    int num;



    for (i=0; i < mysize; i++){

       cout << "Enter a number 1-100: ";

       cin >> num;

       if ((num < 1)||(num > 100)){

           cout << "\n\nEnter a correct number please.\n\n";

           i = i - 1;

       } else {

           mylist[i] = num;

       }

    }

}





int main()

{

  Heapsort heap;



  heap.get_size();



  cout << endl << endl;



  heap.fill_array();



  cout << endl << endl;

    

  return (0);

}

Tic-Tac-DOH!!

mitchstokes225 — Fri, 20 Nov 2009 01:18:51 GMT

Here is my assignment.
5. Assignment: Using the code given below develop a solution to the game Tic-Tac-Toe.
a. The game is played between a human user and the computer. The computer’s moves are made randomly. You must get 3-in-a-row to win; getting five of the nine squares is a tie game.
b. Use proper designing strategies. All input and output should be done in a single module (I/O should not be done in strategy modules). Have an introduction screen that explains how to play the game, let the user know the computer’s move at each turn, and have an ending screen announcing the winner.
6. Complete all function stubs and correct the logic of the main() to obtain a working program.

The starting code;

#include 

#include 

using namespace std; 

//Purpose: Prints to the screen the an introduction and 

// provides the rules of the game

//Input: None

//Output: None

void Intro()                                

{

}

//Purpose: allows the computer to make a move

//Input: B[][] a 2 dimensional array that represents the board

//Output: B[][], the board that has been updated with the computer's move 

void ComputerMove(char B[][3])     

{ int i=0, turn=0;      

      cout<<"\n IN COMPUTER MOVE \n";

 //while (turn==0)     //Make sure the move is ok

      { 

      i=rand()%9+1;     //randomize a move

      if (i==1)      // make sure the first location is not taken

        {

            if ((B[0][0]!='x')&&(B[0][0]!='o'))

                  {     B[0][0]='o';  //if not taken, then move

                        turn=1;

                  }           

        }

      /*********

      repeat the above check for all locations

      ***********/

      }

}











//Purpose: allows the user to make a move

//Input: B[][] a 2 dimensional array that represents the board

//Output: B[][], the board that has been updated with the human's move 

void HumanMove(char B[][3]) 

{int i=0, turn=0;

cout<<"\n IN HUMAN MOVE \n";

/*************

// the logic is similar to the computer move except that 

// it takes the location from the keyboard

****************/

}

//Purpose: Print out the board

//Input: B[][] a 2 dimensional array that represents the board

//Output: None

void PrintBoard(char B[][3]) 

{     cout<<"\n   "<
      cout<<"\n_________________";

      cout<<"\n   "<
      cout<<"\n_________________";

      cout<<"\n   "<
      cout<<"\n\n";

}

//Purpose: Check for a winner

//Input: B[][] a 2 dimensional array that represents the board

//Output: win and integer indicating winner status. 

//       0=no winner, 1= human winner, 2= computer winner

int CheckWin(char B[][3])

{     int win = 0;                                    

      cout<<"\n IN CHECK WIN "<
      return (win);

}

void main ()

{int choice=0, done=0, t=0, w=0;                                              

char Board[3][3]={{'1','2','3'},{'4','5','6'},{'7','8','9'}};

srand(time(0));

Intro();

PrintBoard(Board);

cout<<"Do you want to go first? Enter 1 for yes, 2 for no";

cin>>choice;

      if (choice==1)                                  //if player wishes to go first

      { 

            do{ cout<<"\n t = "<
            HumanMove(Board);

            w=CheckWin(Board);

            if (w==1)                           

               cout<<"Youwin!";                                   

            else if (w==2)

                  cout<<"You lose!";

            else if (t==9&&w==0)

                  cout<<"Tie Game";

            PrintBoard(Board);

            ComputerMove(Board);

            w=CheckWin(Board);

            if (w==1)

                  cout<<"You Win!";

            else if (w==2)

                  cout<<"You lose!";

            else if (t==9&&w==0)

                  cout<<"Tie Game";

            PrintBoard(Board);

            t=t+1;

            }while((t!=9)||(w!=0));                                     

      }

      else                    

      {

            do{   cout<<"\n t = "<
            ComputerMove(Board);

            w=CheckWin(Board);

           if(w==1)                                                                              cout<<"You Win!";

           else if (w==2)

                  cout<<"You lose!";

           else if (t==9&&w==0)

                  cout<<"Tie Game";

            PrintBoard(Board);

            HumanMove(Board);

            w=CheckWin(Board);

            if (w==1)

                  cout<<"You Win!";

            else if (w==2)

                  cout<<"You lose!";

            else if (t==9&&w==0)

                  cout<<"Tie Game";

            PrintBoard(Board);

            t=t+1;

              }while((t!=9)||(w!=0));                               

      }

}

I took this code did all the hard work below;

//Michelle Stokes CSI130 Lab 13

//Code from hand out Lab14 TTT



#include 

#include 

using namespace std; 

//Purpose: Prints to the screen the an introduction and 

// provides the rules of the game

//Input: None

//Output: None

void Intro()                                

{

        cout << "This game is played between a human user and the computer. \n" <<  "The computers moves are made randomly. \n" <<  "You must get 3-in-a-row to win; getting five of the nine squares is a tie game. \n";

        cout << "You player will be lower case 'x'.  You will enter the number of the space you would like to play. \n";

}

//Purpose: allows the computer to make a move

//Input: B[][] a 2 dimensional array that represents the board

//Output: B[][], the board that has been updated with the computer's move 

void ComputerMove(char B[][3])     

{ int i=0, turn=0;      

      cout<<"\n IN COMPUTER MOVE \n";

 //while (turn==0)     //Make sure the move is ok

      { 

      i=rand()%9+1;     //randomize a move

      if (i==1)      // make sure the first location is not taken

        {

            if ((B[0][0]!='x')&&(B[0][0]!='o'))

                  {     B[0][0]='o';  //if not taken, then move

                        turn=1;

                  } 

                }

                        else if (i==2)

                        {        

                        if ((B[0][1]!='x')&&(B[0][1]!='o'))

                  {     B[0][1]='o';  //if not taken, then move

                        turn=1;

                  }

                        }

                        else if (i==3)

                        {                                

                                if ((B[0][2]!='x')&&(B[0][2]!='o'))

                  {     B[0][2]='o';  //if not taken, then move

                        turn=1;

                  }

                        }

                        else if (i==4)

                        {                        

                                if ((B[1][0]!='x')&&(B[1][0]!='o'))

                  {     B[1][0]='o';  //if not taken, then move

                        turn=1;

                  }

                        }

                        else if (i==5)

                        {

                                if ((B[1][1]!='x')&&(B[1][1]!='o'))

                  {     B[1][1]='o';  //if not taken, then move

                        turn=1;

                  }

                        }

                        else if (i==6)

                        {

                                if ((B[1][2]!='x')&&(B[1][2]!='o'))

                  {     B[1][2]='o';  //if not taken, then move

                        turn=1;

                  } 

                        }

                        else if (i==7)

                        {

                                if ((B[2][0]!='x')&&(B[2][0]!='o'))

                  {     B[2][0]='o';  //if not taken, then move

                        turn=1;

                  }

                        }

                        else if (i==8)

                        {

                                if ((B[2][1]!='x')&&(B[2][1]!='o'))

                  {     B[2][1]='o';  //if not taken, then move

                        turn=1;

                  }

                        }

                        else if (i==9)

                        {

                                if ((B[2][2]!='x')&&(B[2][2]!='o'))

                  {     B[2][2]='o';  //if not taken, then move

                        turn=1;

                  }

                        }

                }

      }





//Purpose: allows the user to make a move

//Input: B[][] a 2 dimensional array that represents the board

//Output: B[][], the board that has been updated with the human's move 

void HumanMove(char B[][3]) 

{int i=0, turn=0;

cout<<"\n IN HUMAN MOVE \n";

//while (turn==0)     //Make sure the move is ok

      { 

                  cout << "Please enter the number of the space you would like to move to: ";

                  cin >> i;     

      if (i==1)      // make sure the first location is not taken

        {

            if ((B[0][0]!='x')&&(B[0][0]!='o'))

                  {     B[0][0]='x';  //if not taken, then move

                        turn=1;

                  } 

                }

                        else if (i==2)

                        {

                                if ((B[0][1]!='x')&&(B[0][1]!='o'))

                  {     B[0][1]='x';  //if not taken, then move

                        turn=1;

                  }

                        }

                        else if (i==3)

                        {

                                if ((B[0][2]!='x')&&(B[0][2]!='o'))

                  {     B[0][2]='x';  //if not taken, then move

                        turn=1;

                  }

                        }

                        else if (i==4)

                        {

                                if ((B[1][0]!='x')&&(B[1][0]!='o'))

                  {     B[1][0]='x';  //if not taken, then move

                        turn=1;

                  }

                        }

                        else if (i==5)

                        {

                                if ((B[1][1]!='x')&&(B[1][1]!='o'))

                  {     B[1][1]='x';  //if not taken, then move

                        turn=1;

                  } 

                        }

                        else if (i==6)

                        {

                                if ((B[1][2]!='x')&&(B[1][2]!='o'))

                  {     B[1][2]='x';  //if not taken, then move

                        turn=1;

                  } 

                        }

                        else if (i==7)

                        {

                                if ((B[2][0]!='x')&&(B[2][0]!='o'))

                  {     B[2][0]='x';  //if not taken, then move

                        turn=1;

                  }

                        }

                        else if (i==8)

                        {

                                if ((B[2][1]!='x')&&(B[2][1]!='o'))

                  {     B[2][1]='x';  //if not taken, then move

                        turn=1;

                  }

                        }

                        else if (i==9)

                        {

                                if ((B[2][2]!='x')&&(B[2][2]!='o'))

                  {     B[2][2]='x';  //if not taken, then move

                        turn=1;

                  }

                        }

                }

          }



//Purpose: Print out the board

//Input: B[][] a 2 dimensional array that represents the board

//Output: None

void PrintBoard(char B[][3]) 

{     cout<<"\n   "<
      cout<<"\n_________________";

      cout<<"\n   "<
      cout<<"\n_________________";

      cout<<"\n   "<
      cout<<"\n\n";

}

//Purpose: Check for a winner

//Input: B[][] a 2 dimensional array that represents the board

//Output: win and integer indicating winner status. 

//       0=no winner, 1= human winner, 2= computer winner

int CheckWin(char B[][3])

{     int win = 0;                                    

    if((B[0][0] == B[0][1] && B[0][1] == B[0][2]))

        {

                if (B[0][0]=='x')

                        win=1;

                else if (B[0][0]=='o')

                        win=2;

                if (B[0][1]=='x')

                        win=1;

                else if (B[0][1]=='o')

                        win=2;

                if (B[0][2]=='x')

                        win=1;

                else if (B[0][2]=='o')

                        win=2;

        }

        if ((B[1][0] == B[1][1] && B[1][1] == B[1][2]))

        {

                if (B[1][0]=='x')

                        win=1;

                else if (B[1][0]=='o')

                        win=2;

                if (B[1][1]=='x')

                        win=1;

                else if (B[1][1]=='o')

                        win=2;

                if (B[1][2]=='x')

                        win=1;

                else if (B[1][2]=='o')

                        win=2;

        }

        if ((B[2][0] == B[2][1] && B[2][1] == B[2][2]))

        {

                if (B[2][0]=='x')

                        win=1;

                else if (B[2][0]=='o')

                        win=2;

                if (B[2][1]=='x')

                        win=1;

                else if (B[2][1]=='o')

                        win=2;

                if (B[2][2]=='x')

                        win=1;

                else if (B[2][2]=='o')

                        win=2;

        }

        if ((B[0][0] == B[1][1] && B[1][1] == B[2][2]))

        {

                if (B[0][0]=='x')

                        win=1;

                else if (B[0][0]=='o')

                        win=2;

                if (B[1][1]=='x')

                        win=1;

                else if (B[1][1]=='o')

                        win=2;

                if (B[2][2]=='x')

                        win=1;

                else if (B[2][2]=='o')

                        win=2;        

        }

        if ((B[0][2] == B[1][1] && B[1][1] == B[2][0]))

        {

                if (B[0][2]=='x')

                        win=1;

                else if (B[0][2]=='o')

                        win=2;

                if (B[1][1]=='x')

                        win=1;

                else if (B[1][1]=='o')

                        win=2;

                if (B[2][0]=='x')

                        win=1;

                else if (B[2][0]=='o')

                        win=2;        

        }

        if ((B[0][0] == B[1][0] && B[1][0] == B[2][0]))

        {

                if (B[0][0]=='x')

                        win=1;

                else if (B[0][0]=='o')

                        win=2;

                if (B[1][0]=='x')

                        win=1;

                else if (B[1][0]=='o')

                        win=2;

                if (B[2][0]=='x')

                        win=1;

                else if (B[2][0]=='o')

                        win=2;        

        }

        if ((B[0][1] == B[1][1] && B[1][1] == B[2][1]))

        {

                if (B[0][1]=='x')

                        win=1;

                else if (B[0][1]=='o')

                        win=2;

                if (B[1][1]=='x')

                        win=1;

                else if (B[1][1]=='o')

                        win=2;

                if (B[2][1]=='x')

                        win=1;

                else if (B[2][1]=='o')

                        win=2;        

        }

        if ((B[0][2] == B[1][2] && B[1][2] == B[2][2]))

        {

                if (B[0][2]=='x')

                        win=1;

                else if (B[0][2]=='o')

                        win=2;

                if (B[1][2]=='x')

                        win=1;

                else if (B[1][2]=='o')

                        win=2;

                if (B[2][2]=='x')

                        win=1;

                else if (B[2][2]=='o')

                        win=2;        

        }

        cout<<"\n IN CHECK WIN "<
      return (win);

}

void main ()

{int choice=0, done=0, t=0, w=0;                                              

char Board[3][3]={{'1','2','3'},{'4','5','6'},{'7','8','9'}};

srand(time(0));

Intro();

PrintBoard(Board);

cout<<"Do you want to go first? Enter 1 for yes, 2 for no: ";

cin>>choice;

      if (choice==1)                                  //if player wishes to go first

      { 

            do{ cout<<"\n turn = "<
            HumanMove(Board);

            w=CheckWin(Board);

            if (w==1)                           

               cout<<"Youwin!";                                   

            else if (w==2)

                  cout<<"You lose!";

            else if (t==9&&w==0)

                  cout<<"Tie Game";

            PrintBoard(Board);

            ComputerMove(Board);

            w=CheckWin(Board);

            if (w==1)

                  cout<<"You Win!";

            else if (w==2)

                  cout<<"You lose!";

            else if (t==9&&w==0)

                  cout<<"Tie Game";

                        PrintBoard(Board);

            t=t+1;

            }while((t!=9)||(w!=0));                                     

      }

      else                   

      {

            do{   cout<<"\n turn = "<
            ComputerMove(Board);

            w=CheckWin(Board);

           if(w==1)

                             cout<<"You Win!";

           else if (w==2)

                 cout<<"You lose!";

           else if (t==9&&w==0)

                 cout<<"Tie Game";

            PrintBoard(Board);

            HumanMove(Board);

            w=CheckWin(Board);

            if (w==1)

                  cout<<"You Win!";

            else if (w==2)

                  cout<<"You lose!";

            else if (t==9&&w==0)

                  cout<<"Tie Game";

            PrintBoard(Board);

            t=t+1;

              }while((t!=9)||(w!=0));                               

          }

}

While still in the lab I was able to get the program going. However I can't get it to stop after someone wins, nor can I get the tie to work (might be related).

Please help! The program has to be in this format as he gave us the guide line and told us something in main was broken.... :)

.h file of class

Dewey1040 — Fri, 20 Nov 2009 01:08:14 GMT

So this is just the beginning of my questions, but I'm seriously having problems using classes in C++, I'm writing a program right now to plot points using asterisks on a 40 by 40 plain. right now I'm just trying to write the .h for the point class and i cant even get that to compile.

heres what I have followed by errors I'm receiving... any help in regards to classes or just help with the errors will be appreciated.



#ifndef POINT_H

#define POINT_H



#include 

#include "arrayholder.h"



class Point{



 public:

  Point(): x(0.0), y(0.0), next() {};



  void addPoint( char a[][] );



private:

double x;

double y;

Point* next;



};



#endif

and my arrayholder.h file

#ifndef ARRAYHOLDER_H

#define ARRAYHOLDER_H



#include 

using namespace std;



#include "rectangle.h"

#include "point.h"



class arrayholder{



private:

char a[40][40];

Point* listpointer;



public:



 char** initarray();

 void printRect();

 void printPoints();

};



#endif

In file included from point.h:13:
arrayholder.h:22: error: ISO C++ forbids declaration of `Point' with no type
arrayholder.h:22: error: expected `;' before '*' token

I'm getting the same two errors for rectangle.h

Link external stylesheet in Visual studio 2008

Tales — Fri, 20 Nov 2009 00:12:35 GMT

I'm making a project in Visual studio 2008.
The details of the project are:
- It is a MFC Application
- The application type is Dialog based with Use HTML Dialog enabled
- The project style is MFC standard and...
- The use of the MFC is in a shared DLL

When it creates the project, I have an HTML file called myApp.htm
which contains the HTML code of the dialog.

I want to apply an external css file to this HTML, so i add:

in the head of the document. But it doesn't work.
So I try using:

but it doesn't work either.
I think there must be a way to do it.
I added the css file to the project.
I have tried everything, but no luck. Can someone give me a hand?
thanks!

need help with using f'riend' to design this program. also, overloading.

simplyscottif — Fri, 20 Nov 2009 00:03:41 GMT

Design a PhoneCall class that holds a phone number to which a call is placed, the length of the call in minutes, and the rate charged per minute. Overload extraction and insertion operations for the class.

Overload the == operator to compare two PhoneCalls. Consider one PhoneCall to be equal to another if both calls are placed to the same number.

Create a main() function that allows you to enter 10 PhoneCalls into an array. If a PhoneCall is already been placed to a number, do not allow a second PhoneCall to the same number

I'm pretty good at logic so i think i can figure that part out, its the syntax and the declarations that i cant wrap my head around

please help!
thank you.

My Program wont Stop?

Ponomous — Thu, 19 Nov 2009 23:23:21 GMT

so i guess there must be some sort of an error in my logic but on line 119 i started a counter that only goes up when a pair is made in the game. Since there are a total of 8 pairs, i set that when the counter is 8 the bool nullexists turns false. when it is false it should skip the while loop and output that you have won.

Any ideas on what is actually wrong here? I did check and the counter is going up at the correct times

here is the code

//*******************************************************************************************************************

// Homework 5

// 

//     

//     

//

// This program is a matching game.  The user uses a cordinant system to select

// cards on a 4x4 board.

// Input:                        the user inputs the cordinants of the cards they want to flip

// Processing:                 the program randomly generates pairs of cards in random locations

//                                        on the 4x4 board.  it also adjusts the user input so that the

//                                        cordinants match with the matrix counting system.

// Output:                         the game board, the cards fliped, if they match, and the next board piece

//*******************************************************************************************************************





#include 

#include 

#include 

using namespace std;



int main()

{

    char comma;

    int row1, row1a, column1, column1a, row2, row2a, column2, column2a, cards[4][4], cards_unflipped[4][4] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0} , counter(0), g(0);

        bool nullexists = true;

    srand((unsigned)time(NULL));

   

    //fill board with pairs

    bool makeNext = false;

    memset(cards, 0, sizeof(cards));

    srand(time(NULL));



        for( int i = 1; i < 9; i++ )

            {

                makeNext = false;

                while(!makeNext)

                    {

                        int x1, y1, x2, y2;

                        x1 = rand()%4;

                        y1 = rand()%4;

                        x2 = rand()%4;

                        y2 = rand()%4;

                        if( (x1 != x2 || y1 != y2) && (cards[x1][y1] == 0 && cards[x2][y2] == 0) )

                        {

                            cards[x1][y1] = i;

                            cards[x2][y2] = i;

                            makeNext = true;;

                        }

                    }

            }

       

                   



        // initial display board

        cout<<"    1 2 3 4\n";

        cout<<"  ";

        for (int i=0; i<=8; i++)

        {

            cout<<"-";

        }



        cout<
  

        for (int r=0; r<4; r++)

        {

                        cout<
            for (int c=0; c<4; c++)

            {

                                cout<
            }

                        cout<
        }







   //Game Loop --------------------------------------------------------------------------------

   while (nullexists = true)



   {

     //selection of cards

    cout << "Please select the first card row and column seperated by a comma.\n";

    cin >> row1a >> comma >> column1a;



    cout<<"Please select the second card row and column seperated by a comma.\n";

    cin>>row2a>>comma>>column2a;

       

        // adjusting for matrix cordinants

        row1 = row1a - 1;

        row2 = row2a - 1;

        column1 = column1a - 1;

        column2 = column2a - 1;



   

        // make sure that the cordinants are on the board

        if (row1a > 4 || row2a > 4 || column1a > 4 || column2a > 4 || row1a < 1 || row2a < 1 || column1a < 1 || column2a < 1)

        {

            cout << "please pick cordinants on the board." << endl <
       

            cout << "Please select the first card row and column seperated by a comma.\n";

            cin >> row1a >>comma >> column1a;



            cout << "Please select the second card row and column seperated by a comma.\n";

            cin >> row2a >> comma >> column2a;



        }

     

        // cards chosen

        cout << "The cards you picked were " << cards[row1][column1] << " and " << cards[row2][column2] << endl;

     

       if (cards[row1][column1]== cards[row2][column2])



       {

            cards_unflipped[row1][column1] = cards[row1][column1];

            cards_unflipped[row2][column2] = cards[row2][column2];





            counter = counter++;

                if (counter == 8)

                {

                    bool nullexists = false;

                }



                                if (bool nullexists = false)

                                {

                                        cout << " Congrats, You Won!" << endl;

                                                break;

                                }



                                

                        cout << "Press n to continue." << endl;

                        while (1)

                         {

                           if (getchar() == 'n')

                           {

                              break;

                                  }

                           }



                 // move to blank screen

                 for (g=0; g <= 20; g++)

                        {

                            cout << endl;

                  }





    //reveal the flipped cards

    cout<<"    1 2 3 4\n";

    cout<<"  ";

    for (int i=0; i<=8; i++)

    {

        cout<<"-";

    }

    cout<
    for (int r=0; r<4; r++)

    {

        cout<
        for (int c=0; c<4; c++)

        {

               

                cout<
            }

        cout<
        }



       }

   

       else

       {

       

            cards_unflipped[row1][column1] = cards[row1][column1];

            cards_unflipped[row2][column2] = cards[row2][column2];

           



                        //reveal the flipped cards

                        cout<<"    1 2 3 4\n";

                        cout<<"  ";

                        for (int i=0; i<=8; i++)

                        {

                                cout<<"-";

                        }

                        cout<
                        for (int r=0; r<4; r++)

                        {

                                cout<
                                for (int c=0; c<4; c++)

                                {

                                        cout<
                                }



                                cout<
                        }



                // pause for user to look at the cards they flipped

                cout << "Press n to continue." << endl;

                while (1)

                {

                        if (getchar() == 'n')

                        {

                                break;

                        }

                }



                //reset flipped cards





                cards_unflipped[row1][column1] = 0;

        cards_unflipped[row2][column2] = 0;





                // move to blank screen



                for (g=0; g <= 20; g++)

                {

                        cout << endl;

                }



                //reveal the flipped cards

                cout<<"    1 2 3 4\n";

                cout<<"  ";

                for (int i=0; i<=8; i++)

                {

                        cout<<"-";

                }

                cout<
                for (int r=0; r<4; r++)

                {

        cout<
                        for (int c=0; c<4; c++)

                        {            

                                cout<
            }

                        cout<
        }



           }

       

    }



        //GAME LOOP END -------------------------------------------------------------------------------



   cout << "You Won!" << endl;

 



    return 0;

}

Confused about my pseudocodes

confusedndazed — Thu, 19 Nov 2009 23:03:29 GMT

Pseudocode is still somewhat confusing and I've been reading and this assignment for the a while now and I wanted to make sure I am understanding what's being asked of me. Could someone please tell me if my pseudocodes are correct?

Question:

1. Using pseudocode declare a Real number named temperature.

2. Using pseudocode declare a variable to store the Julian day (1-366) named JDay

3. Write pseudocode that asks a user to enter string variables to store a person’s lastname and birthdate. Then output the lastname and birthdate separated by a comma.

My pseudocode:

1. Declare temperature as double

2. Declare JDay as Integer

3. Declare LastName as string
Declare BirthDate as string
Write “Enter your last name”
Input LastName
Write “Enter your birthdate”
Input BirthDate
Set UserInfo = LastName = “ , “ + Birthdate

Reverse number

maverick405 — Thu, 19 Nov 2009 22:35:12 GMT

Hi, I wounder if anyone can help me start a program which takes "USER INPUT" for any 10 numbers and then print them in reverse order using arrays what should I need to do to get started with this. Please help.

Thanks,
Maverick

reading date using classes

the great — Thu, 19 Nov 2009 21:29:02 GMT

hello
i have given a program which uses the class. It reads the date of birth. And do all the necessary checks on the given value. e.g. What is the limit of that particular month, whether it is a leap year or not. I am writting the first program using classes. I am having problemin my switch statements which i used for checks the more I try to solve the more I get confused. Need your help. Please check my program. I know it is having many other mistakes also.

#include

#include

class date

{

public:

date();

void setdate(int, char, int);

void printdate();

private:

int day;

char month[50];

int year;

};

date::date()

{

day=1;

month= 'January';

year= 1990;

}

void date::setdate(int d, char m[50], int y)

{

day = d;

month =m; 

year = (y>= 1900 && y<= 3000)? y : 1900;

switch (m)

{

case 1: 'January'

    d>=1&&d<=31;

    break;

case 2: 'Febrary'

    {

    if (y%4==0)

    d>=1&&d<=29;

    else

    d>=1&&d<=28;

    }

    break;

case 3: 'March'

    d>=1&&d<=31;

    break;

case 4: 'Apirl'

    d>=1&&d<=30;

    break;

case 5: 'May'

    d>=1&&d<=31;

    break;

case 6: 'June'

    d>=1&&d<=30;

    break;

case 7: 'July'

    d>=1&&d<=31;

    break;

case 8: 'August'

    d>=1&&d<=31;

    break;

case 9: 'September'

    d>=1&&d<=30;

    break;

case 10: 'October'

    d>=1&&d<=31;

    break;

case 11: 'November'

    d>=1&&d<=30;

    break;

case 12: 'December'

    d>=1&&d<=31;

    break;

}

}

void date::printdate()

{

cout<
}

void main()

    {

    date da;

    da.setdate(20,Febrary,1990)

    cout<<"The date of birth is : ";

    da.printdate;

    getch();

    }

functions that take in iostream as parameter

red999 — Thu, 19 Nov 2009 20:33:21 GMT

I recently needed to add member functions like these into my class

istream& read(istream&) ;

ostream& print(ostream&);

I am a little confused on how to actually call these functions within my class. I am more familiar with overloading the insertion and extraction operator since the prototype for those makes a lot more sense to me; however, one of my program spec is that I need to use these. What do I need to put into the function as a parameter?

Please Help Me with this little bug in my program (Program due in 8 hrs)

bpt0004 — Thu, 19 Nov 2009 19:58:45 GMT

My program deals with the Genetic Algorithm and Hill Climber Algorithm. I have a program that compiles without any errs, its just the data is gives is incorrect. I explain my error on the bottom part of my post

Header File

#include 

using namespace std;

//------------------------------------------------------------------------------

    template

    class redefinedVector

   {

   public:

      redefinedVector();

      int get_size() const; 

      int get_capacity() const; 

      void push_back(T);

      void pop(); 

      void resize(); 

      void print(); 

      T& operator[](int index); 

      ~redefinedVector(); 

  

   private:

      T *basket; 

      int capacity, size;

   };

//------------------------------------------------------------------------------   

    class Individual

   {

   public:

      friend class GeneticAlgorithm;

      friend class HillClimberAlgorithm;

      friend class UserInterface;

      

      Individual(); 

      Individual(int problem); 

      

      double randomization(double, double); 

      double GetData(int index) const;

      double GetFitness() const

       { 

         return fitness;

       }

       

      void SetProblem(int problem);

      void MathProblemsFitness();      

      void setData(int index,double numbers); 

      

      int getProblem()const

       { 

         return problem;

       }

   private:

      double data[30]; 

      double fitness; 

      double max; 

      double min; 

      int problem; 

   };

 

//------------------------------------------------------------------------------



class UserInterface

   {

   public:

      UserInterface();

      UserInterface(bool parameters, bool Problem, bool Optimization); 

      

      void setTimeResult(int,int);

      void setDataResult(int,Individual);

      

      Individual GetDataResult(int)const;     

      int getTimeResult(int) const;

   private:

      int highestTimes [3];

      Individual best [3];

   }; 

//------------------------------------------------------------------------------ 

 class GeneticAlgorithm

   {

       friend class UserInterface;

   public:

          

      GeneticAlgorithm(); 

      GeneticAlgorithm(int,int,double,double); 

          

      redefinedVector individualResults;

      redefinedVector iterationVector;

      redefinedVector mainVector;

      

      

      int selection(int); 

      int randomization(int,int); 

      int checkAnswer(); 

      int rando(double);

      

      double randomizationDouble(double min, double max);

      

      void Breed(int,int,int,double,double); 

      void replace(Individual);      

      void Optimize(int, int,double,double);

      

   private:

      int parent1, parent2;

      int iterationNumber; 

   };

//------------------------------------------------------------------------------

class HillClimberAlgorithm

{

      public:



             HillClimberAlgorithm ();

             HillClimberAlgorithm(int problem, double mutation_chance, double mutation_amount);

             

             redefinedVector finalHillClimber;

             redefinedVectorrunTime;

             redefinedVector hillVector;

             

             int randomization(int,int); 

             int checkAnswer();

             int rando(double mutation_rate);

  

             double randomizationDouble(double min, double max);

             void replace(Individual individual);

             

               

      private:          

             int inidividualA, individualB;

             int counter;

             double fitness;

};

Implementation

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include "bpt0004_3.h"



using namespace std;

using std :: ifstream;

using std :: ofstream;

using std :: endl;



template

    redefinedVector::redefinedVector() :capacity(2), size(0)

   {

      basket = new T [capacity];

   }



    template

    void redefinedVector::push_back(T element)

   {

      if(size < capacity)

      {

         basket[size] = element; 

         size++;

      }

      else 

      {

         resize();

         basket[size] = element;

         size++; 

      }

   }

 

    template

    T& redefinedVector::operator[](int index)

   {

      if(index >= size) 

      {

         cout << "Illegal index." << endl; 

         exit(0);

      }

      return basket[index]; 

   }

  

    template

    void redefinedVector::pop()

   {

      if(size != 0)

      {

         size--; 

         capacity = size + 1; 

         T *newBasket = new T[capacity]; 

         for(int i = 0; i < size; i++)

         {

            newBasket[i] = basket[i];

         }

         delete [] basket; 

         basket = newBasket; 

      }

      else

      {

         cout << "Vector is Empty." << endl;

      } 

   }



    template

    redefinedVector::~redefinedVector()

   {

      delete [] basket;

   }



    template

    void redefinedVector::resize()

   { 

      T *newBasket = new T[capacity + 2]; 

      for(int i = 0; i < size; i++) 

      {

         newBasket[i] = basket[i];

      }

      delete [] basket; 

      basket = newBasket; 

      capacity += 2; 

   }

 

    template

    void redefinedVector::print()

   {

      for(int i = 0; i < size; i++)

      {

         cout << basket[i] << " ";

      }

   }

 

    template

    int redefinedVector::get_size() const

   {

      return size;

   }



    template

    int redefinedVector::get_capacity() const

   {

      return capacity;

   } 

//-----------------------------------------------------------------------------



UserInterface::UserInterface()

   {

   }

 

int UserInterface::getTimeResult(int index)const

   {

      return highestTimes[index];

   }

void UserInterface::setTimeResult(int index, int numbers)  

   {

      highestTimes[index] = numbers;

   } 

Individual UserInterface::GetDataResult(int index)const

   {

      return best[index];

   }

void UserInterface::setDataResult(int index, Individual indiv)  

   {

      best[index] = indiv;

   }

UserInterface::UserInterface(bool parameters, bool Problem, bool Optimization)

   {                                  

   /*

   UserInterface Method that is the main menu for the user. Each bool parameter

   ensures that values are entered into various parts within the menu.

   */

   srand (time(0));

      

     

      bool sc = false;

      bool ro = false;

      bool gr = false;

      int userChoice = 0;

      int populationSize= 0; 

      int problem =0;

      int algoChoice=0;

      double mutation_amount=0; 

      double mutation_rate=0;

      bool menuBool=true;

          

      while(userChoice != 6)

      {

         do{ 

            cout << "Function Optimizer:\n" 

                 << "\n"

                 << "1. Choose Algorithm \n"

                 << "2. Choose Algorithm Parameters\n" 

                 << "3. Choose Problem (Schwefel, Rosenbrock, Griewangk).\n" 

                 << "4. Perform Optimization\n"  

                 << "5. Show All Optimization Results\n" 

                 << "6. Exit the System\n"

                 << "\n"

                 << "";

                       

            if(!(cin >> userChoice))

            {

               cout << endl;

               cout << "Unknown Value!" << endl;

               exit(0);

            } 

                   

            cout << endl;

         }

         

         while(userChoice > 6 || userChoice < 1); 

         

         if(userChoice ==1)

         {

          do

          {

            cout << "Enter Algorithm Choice\n"

                 << "1. HillClimber\n"

                 << "2. GeneticAlgorithm\n"

                 << endl;

            if (!(cin >>algoChoice))

            {

                      cout << endl;

                      cout << "Unknown Value!" <
                      exit(0);

            }

            if (algoChoice==1)

               cout <<"Hill Climber Chosen \n"

                    <<"";

            if (algoChoice==2)

               cout <<"GeneticAlgorithm Chosen\n"

                    <<"";

            }

            while((algoChoice < 0)&&(algoChoice >2));

            }             

                    

         if(userChoice == 2)

         {

            cout <<"Enter parameters for each algorithm. Only the mutation amount and mutation\n"

                 <<"chance will be used for the Hillclimber, the Genetic will take in the muation \n"

                 <<"chance, mutation amount, and population size.\n"

                 <<"\n";

            do{

               cout << "Enter Mutation Amount(.03-1.0): ";

               if(!(cin >> mutation_amount))

               {

                  cout << endl;

                  cout << "Unknown Value!" << endl;

                  exit(0);

               }

               cout << endl;

            }

            while(mutation_amount < -1);

        

            do{

               cout << "Enter Mutation Rate (.03-.25): ";

               if(!(cin >> mutation_rate))

               {

                  cout << endl;

                  cout << "Unknown Value!" << endl;

                  exit(0);

               }

               cout << endl;

            }while(mutation_rate < -1);

        

            do{

               cout << "Enter Population Size (2-50): ";

               if(!(cin >> populationSize))

               {

                  cout << endl;

                  cout << "Unknown Value!" << endl;

                  exit(0);

               }

               cout << endl;

               }

            

            while(populationSize < 2);

            parameters = true;

         }

        

         else if(userChoice == 3)

         {

            do{

               cout << "Choose a problem (Schwefel, Rosenbrock, Griewangk)." << endl;

               cout << "1 Schwefel" << endl;

               cout << "2 Rosenbrock" << endl;

               cout << "3 Griewangk" << endl;

            

               if(!(cin >> problem))

               {

                  cout << endl;

                  cout << "Unknown Value!" << endl;

                  exit(0);

               }

               cout << endl;

               if(problem == 1)

               {

                  sc = true;

               }

               else if(problem == 2)

               {

                  ro = true;

               }

               else if(problem == 3)

               {

                  gr = true;

               }

            }while(problem > 3 || problem < 1);

            Problem = true;

         }

        

         else if(userChoice == 4)

         {

            if(!parameters || !Problem)

            {

               cout << "Error" << endl << endl;

            }

            

            if (algoChoice==1)

            {

               HillClimberAlgorithm(problem, mutation_rate, mutation_amount);

               Optimization = true;

            }

            else if (algoChoice==2)

            {

               GeneticAlgorithm(problem,populationSize,mutation_rate,mutation_amount);             

               Optimization = true;

               

            }

         }

        

         else if(userChoice == 5)

         {

            if(!Optimization)

            {

               cout << "Optimization not run" << endl << endl;

            }

            else

            {

               if(sc == true)

               {

               

                  cout <<"Iterations: " << highestTimes[0] <<"\n";

               }

               else

               {

                  cout << "Schwefel information empty\n"

                       <<" " ;

                       

               }

               if(ro == true)

               {

              

                  

                  cout <<"Iterations: " << highestTimes[1] <<"\n";

               }

               else

               {

                  cout << "Rosenbrock information empty\n" 

                       << " " ;

               }

               if(gr == true)

               {

                 

                  cout <<"Iterations: " << highestTimes[2] <<"\n";

                 

               }

               else

               {

                  cout << "Griewangk information empty" << endl << endl;

               }

               }

              

         }

        

         else if(userChoice == 6)

         {

            cout << "Exiting" << endl;

            exit(0);

         }

         }   

   }

//------------------------------------------------------------------------------

HillClimberAlgorithm::HillClimberAlgorithm() 



{

}

void HillClimberAlgorithm::replace(Individual newIndividual)

/*Replace takes the least fit individual and replaces it the the newIndividual

Pre-condition: takes in a newIndividual of type Individual, which sets a vector of random integers between a range

determined by the problem.

Post-condition replaces the current individual at hillvector[i] with the newIndividual

*/

   {

      double temp = hillVector[0].GetFitness(); 

      int index = 0; 

      for(int i = 1; i < hillVector.get_size(); i++)

      {

         if(temp < hillVector[i].GetFitness())

         {

            temp = hillVector[i].GetFitness();

            index = i; 

         }

      }

     

      for(int i = 0; i < 30; i++)

      {

         hillVector[index].setData(i,newIndividual.GetData(i));

         hillVector[index].MathProblemsFitness();

      }

     

      counter++;

     }

int HillClimberAlgorithm::rando(double mutation_rate)

/*

Pre-condition: user entered mutation_rate

Post-condition: generates a random double based on the mutation_rate

*/

   {

      double number = rand() / (double)RAND_MAX;

      return number < mutation_rate;

   }

int HillClimberAlgorithm::randomization(int min, int max)

/*

Pre-condition: 2 integers

Post-condition: random generated integer between the range of min and max

*/

   {

      return static_cast(( static_cast(rand()))/ static_cast( RAND_MAX) *(max-min + 1) + min);

   }

double HillClimberAlgorithm::randomizationDouble(double min, double max)

/*

Pre-condition: 2 double

Post-condition: random generated double between the range of min and max

*/

   {

      return static_cast(rand())/ static_cast( RAND_MAX) *(max-min + 1) + min;

   }

HillClimberAlgorithm::HillClimberAlgorithm(int problem, double mutation_rate, double mutation_amount)

/*

Main constructor used in the HillClimber Algorithm

Pre-condition: takes in three parameters: problem, mutation_rate, mutation_amount

Post-condition: Passes the Individual through the MathProblemsFitness and generates a fitness,

if the fitness is less than the current fitness, than the newIndividual replaces individual

*/

{

       Individual newIndividualA(problem);

       fitness= newIndividualA.GetFitness();

       

       double range=0;

       if(problem == 1) 

      {

         range = 131.072;

      }

      else if(problem == 2)

      {

         range = 4.096;

      }

      else

      {

         range = 1200;

      }

       

       while( fitness < .1)

       {

         int chance = 0;

         int choice = rando(mutation_rate);

         int selection = 0;

         selection = randomization(1,2);

         Individual newIndividualB;

         for(int i = 0; i < 30; i++)

         {

         if(choice == 1)

         {

         

          

            double newData = hillVector[selection].GetData(i); //get the data from the chosen parent

            newData = newData + range*(randomizationDouble(0,2)-1)*mutation_amount; //mutate it occording to the formula

            newIndividualB.setData(i,newData); //set the new data into the corresponding index of the child object

            if(newData > range/2) //if the number goes out of the upper bounds

            {

               newIndividualB.setData(i,range/2);

            }

            else if(newData < ((range/2)*-1)) //if the number gooes out of the lower bounds

            {

               newIndividualB.setData(i,((range/2)*-1));

            }

         }

         else 

         {

            newIndividualB.setData(i,hillVector[selection].GetData(i));

         }

      }

         

              int iterations=0;

              for (int i=0; i < 30; i++)

              {

           

               Individual newIndividualB (problem);           

               newIndividualB.setData(i,newIndividualB.GetData(i)+newIndividualB.GetData(i)*((static_cast(rand())/ static_cast( RAND_MAX) *(2-0 + 1) + 0))*mutation_amount); 

               double newFitness=newIndividualB.GetFitness();

               

               iterations++;

             

             if (newFitness < fitness)

             { newIndividualB.MathProblemsFitness();

               replace(newIndividualB);

             }

               

             

              cout << iterations << endl;            

               }  

               

       }  

        

       }

//------------------------------------------------------------------------------

Individual::Individual() 

   {

   }

  

double Individual::GetData(int index) const

   {

      return data[index]; 

   }

  

void Individual::setData(int index, double numbers) 

   {

      data[index] = numbers;

   }

  

void Individual::SetProblem(int Problem) 

   {

      problem = Problem; 

   }



Individual::Individual(int problem)

/*

Creates a new individual, and based on the problem, enters random values into 

a vector and passes that vector through MathProblemsFitness to create a fitness



Pre-condition:user entered problem

Post-condition: New individual created based on the problem choice and a fitness calculated

*/

   {

      SetProblem(problem); 

      if(problem == 1)

      {  

      for(int i = 0; i < 30; i++)

      {

         data[i] = randomization(-65.536,65.536);

      }         

      }

      else if(problem == 2)

      { 

      for(int i = 0; i < 30; i++)

      {

         data[i] = randomization(-2.048,2.048);

      }

      }

      else if(problem == 3)

      {

      

      for(int i = 0; i < 30; i++)

      {

         data[i] = randomization(-600,600);

      }

      }

      

      MathProblemsFitness();

   }

 

 double Individual::randomization(double min, double max) 

   {

      return static_cast(rand())/ static_cast( RAND_MAX) *(max-min + 1) + min;

   }

 

    void Individual::MathProblemsFitness()

    /*

    MathProblemsFitness defines the three math probelems (Schwefel, Rosenbrock, Griewangk)

    each vector from individual passes through these problems to calculate a fitness

    */

   {

      double holder = 0;

      double temp2 = 1;

      fitness = 0; 

      int next = 1; 

      if(problem == 1) 

      {

         for(int i = 0; i < 30; i++)

         {

            holder = 0;

            for(int j = 0; j < next; j++)

            {

               holder = holder + data[j];

            }

            next++;

            fitness = fitness + (holder*holder);

         }

      }

      else if(problem == 2)

      {

         for(int i = 0; i < 29; i++)

         {

            holder = 0;

            holder = 100*(data[i+1]-(data[i]*data[i]))*(data[i+1]-(data[i]*data[i])) + (data[i] - 1)*(data[i] - 1);

            fitness = fitness + holder;

         }

      }

      else if(problem == 3)

      {

         for(int i = 0; i < 30; i++)

         {

            holder = 0;

            holder = (data[i]*data[i])/4000;

            fitness = fitness+ holder;

         }

         fitness = fitness + 1;

       

         for(int i = 0; i < 30; i++)

         {

            holder = 0;

            holder = cos(data[i]/sqrt(i+1));

            temp2 = temp2 * holder;

         }

         fitness = fitness - temp2;

      }

   }

//------------------------------------------------------------------------------    

GeneticAlgorithm::GeneticAlgorithm() 

   {

  

   }

  

  GeneticAlgorithm::GeneticAlgorithm(int problem, int populationSize, double mutation_rate, double mutation_amount)

  /*

  Builds the population of individuals and pushes it into the mainVector, then loop through 5 times

  until the desired value is reached.

  */

   {

      UserInterface m;

      int iterations;

      for(int i = 0; i < 5;  i++)

      {

         iterationNumber = 0; 

         for(int i = 0; i < populationSize; i++)

         {

            Individual I(problem); 

            mainVector.push_back(I); 

         }

         int foundIt = 0; 

         checkAnswer(); 

         while(foundIt == 0 && iterationNumber < 5000000) 

         {

            foundIt = checkAnswer();

            Optimize(problem, populationSize,mutation_rate, mutation_amount); 

            foundIt++;

         }  

            

     

         int index = 0;

         double temp = mainVector[0].GetFitness(); 

         

         for(int i = 1; i < mainVector.get_size(); i++)

         {

                 

            if(temp > mainVector[i].GetFitness())

            {

               temp = mainVector[i].GetFitness();

               index = i; 

            }

         }

         individualResults.push_back(mainVector[index]);

         iterationVector.push_back(iterationNumber);

         

         if(problem == 1)

         {

            if(iterationNumber < m.getTimeResult(0))

            {

               m.setTimeResult(0,iterationNumber);

               m.setDataResult(0,mainVector[index]);

            }

         }

         

         else if(problem == 2)

         {

            if(iterationNumber < m.getTimeResult(1))

            {

               m.setTimeResult(1,iterationNumber);

               m.setDataResult(1,mainVector[index]);

            }

         }

         else

         {

            if(iterationNumber < m.getTimeResult(2))

            {

                       

               m.setTimeResult(2,iterationNumber);

               m.setDataResult(2,mainVector[index]);

            }

         }

         for(int i = 0; i < populationSize; i++) 

         {

            mainVector.pop();

         }

      }

  

      cout << endl;

      

      cout << "Results: \n"

           << "\n"

           << "";

        

      for(int i = 0; i < individualResults.get_size(); i++)

      {

         cout << endl;

         cout << "Individual Best: ";

         for(int j = 0; j < 30; j++)

         {

            cout << individualResults[i].data[j] << "\n"

                 <<"";

         }

         cout << "\n"

              << "Fitness Level: " << individualResults[i].GetFitness() << "\n"

              << "Iterations: " << iterationVector[i] << endl;

      }

     

      for(int i = 0; i < individualResults.get_size(); i++)

      {

         individualResults.pop();

         iterationVector.pop();

      }

      cout << endl;

   }





    

void  GeneticAlgorithm::Optimize(int problem, int populationSize, double mutRate, double mutAmount)

   {

      parent1 = selection(populationSize);

      parent2= selection(populationSize);

      Breed(parent1,parent2,problem,mutRate,mutAmount); 

   }



    void GeneticAlgorithm::Breed(int parent1, int parent2, int problem, double mutation_rate,double mutation_amount)

   {

      Individual child(problem); 

      double range = 0;

      if(problem == 1) 

      {

         range = 131.072;

      }

      else if(problem == 2)

      {

         range = 4.096;

      }

      else

      {

         range = 1200;

      }

      for(int i = 0; i < 30; i++)

      {

         int selection = 0;

         selection = randomization(1,2); 

         if(selection == 1)

         {

            selection = parent1; 

         }

         else

         {

            selection = parent2; 

         }

         int chance = 0;

         int choice = rando(mutation_rate); 

         if(choice == 1) 

         {

          

            double newData = mainVector[selection].GetData(i);

            newData = newData + range*(randomizationDouble(0,2)-1)*mutation_amount; 

            child.setData(i,newData); 

            if(newData > range/2) 

            {

               child.setData(i,range/2);

            }

            else if(newData < ((range/2)*-1)) 

            {

               child.setData(i,((range/2)*-1));

            }

         }

         else 

         {

            child.setData(i,mainVector[selection].GetData(i));

         }

      }

      child.SetProblem(mainVector[parent1].getProblem()); 

      child.MathProblemsFitness(); 

      replace(child); 

   }

  

int GeneticAlgorithm::rando(double mutRate)

   {

      double number = rand() / (double)RAND_MAX;

      return number < mutRate;

   }



void GeneticAlgorithm::replace(Individual child)

   {

      double temp = mainVector[0].GetFitness(); 

      int index = 0; 

      for(int i = 1; i < mainVector.get_size(); i++)

      {

         if(temp < mainVector[i].GetFitness())

         {

            temp = mainVector[i].GetFitness();

            index = i; 

         }

      }

     

      for(int i = 0; i < 30; i++)

      {

         mainVector[index].setData(i,child.GetData(i));

         mainVector[index].MathProblemsFitness();

      }

     

      iterationNumber++; 

 while (iterationNumber ==0)

      //if(iterationNumber %100 == 0) 

      {

                         

         temp = mainVector[0].GetFitness(); 

         for(int i = 1; i < mainVector.get_size(); i++)

         {

            if(temp > mainVector[i].GetFitness())

            {

               temp = mainVector[i].GetFitness();

            }

         }

         cout << "Best Fitness: " << iterationNumber <<" " << temp <
      }  



    

   

   }

  

int GeneticAlgorithm::checkAnswer()

   {

      for(int i = 0; i < mainVector.get_size(); i++)

      {

         if(mainVector[i].GetFitness() < .1)

         {

            return 1;

         }

         else

         {

            return 0;

         }

      }

   }



int GeneticAlgorithm::selection(int populationSize)

   {

      int choice = rand() % populationSize;

      int choice2 = rand() % populationSize;

      if(mainVector[choice].GetFitness() < mainVector[choice2].GetFitness())

      {

         return choice;

      }

      else

         return choice2;

   }

 

 int GeneticAlgorithm::randomization(int min, int max)

   {

      return static_cast(( static_cast(rand()))/ static_cast( RAND_MAX) *(max-min + 1) + min);

   }

  

    double GeneticAlgorithm::randomizationDouble(double min, double max)

   {

      return static_cast(rand())/ static_cast( RAND_MAX) *(max-min + 1) + min;

   }

and Main

#include 

#include "bpt0004_3.h"



using namespace std;



int main() 

   {

      

      bool parameters = false, Problem = false, Optimization = false; 

      UserInterface(parameters, Problem, Optimization);

      

      return 0;

   }

My error:
1. first choose 1, then choose 2 for genetic algorithm
2. choose 2, then input parameters within the ranges given
3. choose 3, and choose 1(schwefel)
4. choose 4 to optimize
5. choose 5 <-----this displays the correct number of iterations
6. choose 3, and choose 2 or 1(Rosenbrock or Griewangk)
7. choose 4 to optimize
8. choose 5 <-----This displays the error

Error
Genetic Iterations Schwefel: -1209686560
Genetic Iterations Rosenbrock: 1
Genetic Iterations Griewangk: -1079226444

Why am i getting negative numbers and why is the iterations for rosenbrock just 1?? Please help me, this program is due tonight.

Just after a little claification im on the right track

Privoxy — Thu, 19 Nov 2009 19:02:22 GMT

Good morning all,

So i have started teaching myself C++ in preparation for taking software engineering at university next year, after many hours i have managed to put a simple program together, Im just asking if someone can tell me on in the right track to understanding what each function does if i break it down,

#include 

using namespace std;

So the iostream allows for keyboard input and the namespace is where code is stored?

        cout << "Enter a real number: ";

        cin >> x;



        cout << "Enter a real number: ";

        cin >> y;

So the user is inputting a number to replace the x and the y with a value,

float x = 0.0;

float y = 0.0;

This is setting the integer value to 0, allowing the user to input a number to replace the 0, and i am using float because of the decimal point

 float a = x;

        float b = x;

        float c = x;

        float d = x;

        float e = x;

This is storing the input from the console window? not 100% sure on what its doing...

        a += y;

        b -= y;

        c *= y;

        d /= y;

And i have no idea what this section does...

        cout << "x += y " << a << endl;

        cout << "x -= y " << b << endl;

        cout << "x *= y " << c << endl;

        cout << "x /= y " << d << endl;

        cout << "x %= y " << e << endl;

And this just outputs the information into the console window, Im pretty down with console output ;)

As i said above, just looking for clarification that i have my mind on the right sort of track and am not embedding wrong information into my head.

Thanks heaps in advance

-Privoxy

Edit:

The full code in view

#include 

using namespace std;



int main()



{

        float x = 0.0;

        float y = 0.0;



        cout << "Enter a real number: ";

        cin >> x;



        cout << "Enter a real number: ";

        cin >> y;



        float a = x;

        float b = x;

        float c = x;

        float d = x;

        float e = x;

        

        a += y;

        b -= y;

        c *= y;

        d /= y;



        cout << "x += y " << a << endl;

        cout << "x -= y " << b << endl;

        cout << "x *= y " << c << endl;

        cout << "x /= y " << d << endl;

        cout << "x %= y " << e << endl;



}

return value is deleted before being passed on... how to avoid?

denizen08 — Thu, 19 Nov 2009 18:46:14 GMT

polynomial polynomial :: derivative(void)

{

        polynomial outpoly;

        outpoly._coef = new double [_degree];

        outpoly._degree = (_degree-1);

        for(int i=0; i<(_degree); i++)

        {

                outpoly._coef[i]=(i+1)*_coef[i+1];

        }

        return outpoly;

}



//header:

#pragma once



#include 

#include 

#include 

#include 



using namespace std;



class polynomial

{

  private:

    double * _coef;

    int _degree;    

  public:

    // constructors    

    polynomial(void);  

    polynomial(int degree, double * coef);

        ~polynomial(void);

    

    // at: evaluates the polynomial at x or z

    //   returns the real/complex value of the polynomial at x/z

    double at(double x) const;

    complex at ( complex z) const;



        polynomial derivative(void) const;

        bool isEmpty(void);

        string tostring(void);



        polynomial& operator = (const polynomial& rhs);

    friend ostream& operator << (ostream& os, polynomial& m);

    

};



//How I use it in main:

double * coef;

int degree;

cout<< "INPUT degree: ";

cin>>degree;

coef = new double [degree+1];

for(int n = 0; n<(degree+1); n++)

{

        cout<< "INPUT " << n << "th degree: ";

        cin>> coef[n];

        cout<
}

polynomial poly(degree, coef);

cout<<"INPUT converted to: " << poly<
cout<<"EVALUATE for x = ";

double x;

cin >> x;

cout << poly << " = " << poly.at(x) << endl;

cout << "DERIVATIVE of fxn is: " << poly.derivative() <

I have code for handling polynomials via an array of coefficients. Now I want to create a function that returns its derivative in polynomial form.



Unfortunately, the return value is deleted before it is passed on. I discovered this the hardway by following the debugger as closely as I could.



How can I avoid this error?

Polynomial division

Rapmanseele — Thu, 19 Nov 2009 17:48:53 GMT

cout<<"hello,everybody!";

Can somebody come for the rescue?

Please *My_problem(Is writing a fuction that divides two polynomials )
{
return rescue;
}

Counting vowels + consonants in string and using pointers

kryz — Thu, 19 Nov 2009 17:46:25 GMT

I'm confused with pointers. I'm not sure how to get the vowels to show up in Case A.

Also, I would need help by how to get the program to run again after case A instead of ending the program after each case. Should it be in if/else statement instead of switch? Or use while loop with switch statement?

Thanks and I appreciate any hints/help! :)

#include 

#include 



using namespace std;



char* getStringFromUser();

int consonants(char* str);  //function to print out consonants

int vowels(char* str);  //function to print out vowels

void stringCopy(char* str1, char* str2);



int main ()

{

        //declare variables to use for storing user's input

        char choice; //first menu

        char line;

        

        //declare variables to use for program

        bool goagain = true;

        int getNumStrings();

        fstream dataFile; //input stream for file        

     

        // introduction to the program 

        cout << "\n\n------------------------------------------------" << endl;

        cout << "\n\nVowels & Consonants" << endl;

        

                dataFile.open("stringFile.txt", ios::out | ios::app); //open file

                if (! dataFile) // test for error

                        cout << "Error opening file.\n";        

        

                cout << "\n\nPlease select from the following menu items:\n";

                cout << "\t A)  Count the vowels of a string.\n";

                cout << "\t B)  Count the consonants of a string.\n";

                cout << "\t C)  Count both vowels and consonants of a string.\n";

                cout << "\t D)  Enter a string in the file.\n";

                cout << "\t E)  Count the number of strings in the file.\n";

                cout << "\t F)  Exit this program.\n\n";

                cout << "\t Enter A, B, C, D, E, or F: ";

                cin >> choice; //user choice of menu

                

                switch(choice)

                {

                        case 'A':        cout << getStringFromUser();

//                                                cout << vowels(line, vowels);

                                                break;

                                          

                        case 'B':         cout << "choice B";          

                                                break;

                                                

                        case 'C':        cout << "choice C"; 

                                                break;

                        

                        case 'D':        cout << "choice D"; 

                                                break;

                        

                        case 'E':        cout << "choice E";

                                                break;

                        

                        case 'F':         cout << "\n\nGoodbye!" << endl;                

                                                break;

                        

                        default: cout << "That is an invalid choice.\n";

                }        

                

                dataFile.close(); //close text file        



        return 0;

}//end of function



char* getStringFromUser()

{

        char line[100];

        

        cout << "Enter a string: ";

        cin.ignore();

        cin.getline(line, 100, '\n');

}                        



int vowels(char* str)

{

        char vowelsArray[] = {'A', 'a', 'E', 'e', 'I', 'i', 'O', 'o', 'U', 'u', '\0'};

        char *vowelsPtr = vowelsArray;

        int numVowels = 0;

        int count;

        

        cout << "The vowels in the string are: ";



        while(*str != '\0')

        {

                for(count = 0; count <10; count++)

                {

                        if (*str == *vowelsPtr)

                        {

                                numVowels++; //Point to next element

                                cout << "The vowels in the string are: " << *vowelsPtr << endl;

                                break;

                        }

                }                

                str++;

                vowelsPtr = vowelsArray; //set vowelsPtr to first element again

        }

        cout << "\n\n";

        return numVowels;

}

need help

kkevin — Thu, 19 Nov 2009 17:36:59 GMT

Hi everyone!! I am Kevin, and I am new to this site. I am taking C++ classes and have trouble writing this program. I know I have to use several "for" loops and "rand" commands to write it but i am not exactly sure how to do that?? so, please can anyone help me with this? the question is:

Use a two dimensional array to solve the following problem. A company has four salesperson (1 to 4) who sell five different different products (1 to 5). Once a day, each salesperson passes in a slip for each different type of product sold. Each slip contains:
1) salesperson number.
2) the product number.
3) total dollar value of the product sold that day.

Each sales person passes between 0 to 5 sales slips perday. Assume that the information from all of the slips for last week is avaible. Write a program that will read all this information and summarize the total sales by salesperson by products. All totals should be stored in a two dimensional array sales. After processing all the information print the result in tabular format with each column representing a particular salesperson and each row representing a particular product. Cross total each row to get the total sales of each product and cross total each column to get the total sales by salesperson. your tabular printout should include these cross totals to the right of the totaled rows and bottom of the totaled columns.

not sure why i am outputting all zeros

Ponomous — Thu, 19 Nov 2009 16:57:16 GMT

So this is a matching game, flip over two cards, if they match they stay up if not they flip over again. I have the matching system and coordinate system working. My problem is that when i use my array of zeros to "hide" the numbers, all that is ever output is the zeros.

Any ideas on why this might be happening? also any ideas on using something other than the number 0 for my grid? like an *? i couldn't figure out how to get an array to take them.

#include 

#include 

#include 

using namespace std;



int main()

{

    char comma;

        int row1, column1, row2, column2, cards[4][4], cards_unflipped[4][4] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0} , counter(0);



    srand((unsigned)time(NULL));

    

        //fill board with pairs

        bool makeNext = false;

        bool nullexists = true;

        memset(cards, 0, sizeof(cards));

        srand(time(NULL));



                for( int i = 1; i < 9; i++ )

                        {

                                makeNext = false;

                                while(!makeNext)

                                        {

                                                int x1, y1, x2, y2;

                                                x1 = rand()%4;

                                                y1 = rand()%4;

                                                x2 = rand()%4;

                                                y2 = rand()%4;

                                                if( (x1 != x2 || y1 != y2) && (cards[x1][y1] == 0 && cards[x2][y2] == 0) )

                                                {

                                                        cards[x1][y1] = i;

                                                        cards[x2][y2] = i;

                                                        makeNext = true;;

                                                }

                                        }

                        }

                                        for( int i = 0; i < 4; i++ )

                                        {

                                                for( int c = 0; c < 4; c++ )

                                                {

                                                        cout << cards[i][c] << " ";

                                                }

                                                cout << endl;

                        







                                        }

    //display board

   while (nullexists = true)



   {

           //selection

    cout<<"Please select the first card row and column seperated by a comma.\n";

    cin>>row1>>comma>>column1;



    cout<<"Please select the second card row and column seperated by a comma.\n";

    cin>>row2>>comma>>column2;



          

         

           if (cards[row1][column1]==cards[row2][column2])



           {

                    cards_unflipped[row1][column1] = cards[row1][column1];

                        cards_unflipped[row2][column2] = cards[row2][column2];





                        counter = counter++;

                                if (counter == 8)

                                {

                                        bool nullexists = false;

                                }



           }



           //reveal the flipped cards

    cout<<"    1 2 3 4\n";

    cout<<"  ";

    for (int i=0; i<=8; i++)

    {

        cout<<"-";

    }

    cout<
    for (int r=0; r<4; r++)

    {

        cout<
        for (int c=0; c<4; c++)

        {

           

                cout<
            }

                cout<
        }

        

    }



   cout << "You Won!" << endl;

  



    return 0;

}

Help with a big project if you can help.

reese27 — Thu, 19 Nov 2009 15:37:42 GMT

I have a project that requires me to make a search engine for classes. If i were to enter Biology, then classes such as genetics, chemistry, anatomy and physiology are to show up. But the thing is i have the classes and their descriptions in a file and i was wondering if anyone can give me some pointers on how to atleast start the project. I really don't know how to group the classes together so that I can compare the words and come up with results....or is there a better way?

Calculate percentage problem

bernaprog — Thu, 19 Nov 2009 15:10:16 GMT

hi, I'm trying to calculate the percentage of an ammount of boxes in C. Ex: 4400.
I have the next code:

#include

#include

main()

{

double a=2400;

double b=8000;

double per=0;

per=2400*100/8000;

cout<
getch();

}

and return a negative value. I try to asign values at differents variables like:

double confused=241541;

double moreconfused=145621;

long int percf=1452145;

cout<and return negatives values too, 

please, somebody can help me?

help me to loop pls

xtian3 — Thu, 19 Nov 2009 13:49:51 GMT

this is the output
when enter 1
*********O*
when enter 2
********O**
----------------------------
1*********O*
2********O**
3*******O***
4******O****
5*****O*****
.
.
.
.
.
.
.

help me plss
tnx

please take a look at this C++ MySQL issue and help

spekulanta — Thu, 19 Nov 2009 13:47:37 GMT

Hi there,

here what my problem is - I'm trying to get data from MySQL database put in on global array and make calculation. The data in the MySQL table is 3000 rows and 2 columns. The type of data is double and date

Here is the code:

#include 

#include 

#include 

#include 



MYSQL conn;

MYSQL_RES *res;

MYSQL_ROW msq_row;



int main()

{



    double mysql_result[3000][2];

    int i;

    int j;

    int history=3000;



  

    mysql_init(&conn);

    mysql_real_connect(&conn, "localhost", "root", "1a2s3d", "portfolio", 0, NULL, 0);



    mysql_query(&conn, "SELECT date, close from quotes where companyID=1");



    res=mysql_use_result(&conn);



  



    for (j=0;j=history;j++)

    {

            for (i=0;i=mysql_num_fields(res);i++)

            {

                

                msq_row=mysql_fetch_row(res);

                mysql_result[3000][2]=msq_row;

                printf("%d\n",msq_row[i]);

          

            }

    }

    mysql_free_result(res);

    mysql_close(&conn);

     





    return (EXIT_SUCCESS);

}

the cygwin g++ compiler give this:

/usr/bin/make -f nbproject/Makefile-Debug.mk SUBPROJECTS= .build-conf
make[1]: Entering directory `/cygdrive/c/Program Files/MyPrograms/Apache/htdocs/QuadProg++/Pordotovka'
/usr/bin/make -f nbproject/Makefile-Debug.mk dist/Debug/Cygwin-Windows/pordotovka.exe
make[2]: Entering directory `/cygdrive/c/Program Files/MyPrograms/Apache/htdocs/QuadProg++/Pordotovka'
mkdir -p build/Debug/Cygwin-Windows
rm -f build/Debug/Cygwin-Windows/main.o.d
g++ -c -g -MMD -MP -MF build/Debug/Cygwin-Windows/main.o.d -o build/Debug/Cygwin-Windows/main.o main.cpp
main.cpp: In function `int main()':
main.cpp:45: error: cannot convert `char**' to `double' in assignment
make[2]: *** [build/Debug/Cygwin-Windows/main.o] Error 1
make[2]: Leaving directory `/cygdrive/c/Program Files/MyPrograms/Apache/htdocs/QuadProg++/Pordotovka'
make[1]: *** [.build-conf] Error 2
make[1]: Leaving directory `/cygdrive/c/Program Files/MyPrograms/Apache/htdocs/QuadProg++/Pordotovka'
make: *** [.build-impl] Error 2
BUILD FAILED (exit value 2, total time: 828ms)

Please give me gleam ... thank you

Asyncronous Overlapped structure problem (using HttpwaitforDisconnect)

JenniLei — Thu, 19 Nov 2009 10:59:26 GMT

Hello guys, I am having trouble getting an asyncronous communications set up using overlapping. Actually to be more specific I am having problems with using httpWaitForDisconnect to work as async.
Using the code below I am able to enter the function, but it is in a blocking state which defeats all the purposes of me trying to use this function in the first place.
The Code:

HANDLE hQueue;

HTTP_REQUEST* pHttpData;

ULONG ulReturn = 0;



OVERLAPPED* ovlp;

        ZeroMemory(&ovlp, sizeof(&ovlp));

ulReturn = HttpReceiveHttpRequest(hQueue, RequestId, 0, pHttpData, dwBufferSize, &dwSizeReceived, ovlp);

RequestId = pHttpData->RequestId;

                if (ulReturn == ERROR_INVALID_PARAMETER)  {

                        AddToTraceLog("HttpReceiveHttpRequest : Invalid Parameter");

                }



                AddToTraceLog("Going into the disconnect");

                ulReturn = HttpWaitForDisconnect(hQueue, pHttpData->ConnectionId, ovlp);

                switch(ulReturn)

                {

                case NO_ERROR:

                        AddToTraceLog("User Has Disconnected...");

                        break;

                case ERROR_IO_PENDING:

                        AddToTraceLog("IO Pending, next request not ready...");

                        break;

                case ERROR_INVALID_PARAMETER:

                        AddToTraceLog("Error" + getLastError());

                        break;

                }

Thank you in advance.

Compiler skips "cin.get();"

duke.tim — Thu, 19 Nov 2009 09:44:15 GMT

this is a simple example of a problem I have been having with differing programs, i am using linux ubuntu 9.10 and codeblocks 8.02 .

this is the code

#include 



using namespace std;

int main()

{

    int hiya;

    cout<<"hello world \n";

    cin.get();

    cout<<"enter a number \n";

    cin>>hiya;

    cout<<"you entered \n"<< hiya;

    cin.get();

}

it compiles but show an error message "warning GDB: Failed to set controlling terminal: operation not permitted"

then the program runs

when it gets to the last cin instead of waiting for some input it exits

Help

ihtesham4deni — Thu, 19 Nov 2009 08:38:31 GMT

complex number

nick30266 — Thu, 19 Nov 2009 04:51:11 GMT

the program is ok(i think)but the data is fixed.i want it able to input your own data.i tried cin>>c1.real>>c1.image;
cin>>c2.real>>c2.image;
but it cannot use them because they are private...

#include

using namespace std;

class complex

{

public:



complex(){real=0;image=0;}



complex(double r,double i){real=r;image=i;}



complex complex_add(complex &c2);



complex complex_sub(complex &c2);



complex complex_mult(complex &c2);



complex complex_div(complex &c2);

void display();



private:

        double real;

        double image;

};





complex complex::complex_add(complex &c2)

{

complex c;



c.real=real+c2.real;



c.image=image+c2.image;



return c;

}



complex complex::complex_sub(complex &c2)



{

 complex d;



d.real=real-c2.real;



d.image=image-c2.image;



return d;

}



complex complex::complex_mult(complex &c2)

{

complex f;



f.real=real*c2.real;



f.image=image*c2.image;



return f;

}



complex complex::complex_div(complex &c2)

{

 complex g;

 g.real=real/c2.real;

 g.image=image/c2.image;

 return g;

}





void complex::display()

{

  cout<<"("<
}





int main()

{

complex c1(2,5),c2(4,9),c3;  //i want input my own complex number.

c3=c1.complex_add(c2);

cout<<"c1=";c1.display();

cout<<"c2=";c2.display();

cout<<"c1+c2=";c3.display();



c3=c1.complex_sub(c2);

cout<<"c1=";c1.display();

cout<<"c2=";c2.display();

cout<<"c1-c2=";c3.display();



c3=c1.complex_mult(c2);

cout<<"c1=";c1.display();

cout<<"c2=";c2.display();

cout<<"c1*c2=";c3.display();



c3=c1.complex_div(c2);

cout<<"c1=";c1.display();

cout<<"c2=";c2.display();

cout<<"c1/c2=";c3.display();



return 0;

}

Class Composition Confusion

swolll — Thu, 19 Nov 2009 04:24:46 GMT

Today was my first time trying composition. It's for a lab project due Friday, and I have a lot of tomorrow to work on it. However, up until we have just been using one class per program. Now, my teacher wants us to use composition and arrays, despite only lecturing on them for a few minutes. Worse, there is no section on composition (and arrays in compositions) in our notes/textbook. So, could you check this code and tell me if I'm on the right track. I don't even need help with syntactical errors (yet); I just need an idea of what I need to do, and what I'm not understanding about composition.

There are five files, and an input file. And the program (as you can see from the input file) reads the student info and stores it in an array and then outputs (1) all information in a table, (2) a student searched by last name, (3) lowest gpa student information, (4) highest units gpa information.

Thank you very much.

student.h

 #ifndef student_H

#define student_H



#include 



using namespace std;



class Student{

        public:

                void set_Name(string, string);         

                bool readStudent(ifstream &);

                void printStudent () const;

                Student();

                string get_Last();

                string get_First();

                void set_Major(string);

                string get_Major( );

                int get_Units();

                void set_Units(int);

                float get_GPA();

                void set_GPA(float);

        private:

                string  First, Last;

                int                Units;

                float        GPA;

                string        Major; 

};



#endif

Student Implementation

#include 

#include 

#include "student.h"



using namespace std;

void Student::set_Name(string first, string last){

        First = first;

        Last = last ;                

}



bool Student::readStudent(ifstream & fin){

        getline(fin, First);

        if (fin){

                 getline(fin, Last);

                getline(fin, Major);

                fin >> Units ;

                fin >> GPA ;

                fin.ignore(10,'\n');

        }

        return (fin.good());

}

void Student::printStudent () const

{

        cout <<"\n\tStudent information:\n";

        cout << "Name:   \t" << Last +", "+ First <
        cout << "Major:  \t" << Major << endl;

        cout << "Units : \t"<< Units <
        cout << "GPA:    \t" << GPA << endl <
}



Student::Student(){

        Units = 0 ;

        GPA = 0 ;

};

string Student::get_Last(){

        return Last; 

}



void Student::set_Major(string t_major){

        Major = t_major;

}

int Student::get_Units(){

        return Units;

}        

float Student::get_GPA(){

        return GPA;

}                        

string Student::get_First(){

        return First ;

}

string Student::get_Major( ){

        return Major ;

}

void Student::set_Units(int units){

        Units = units ;

}

void Student::set_GPA(float gpa){

        GPA = gpa ;

}

school.h

 #ifndef school_H

#define school_H

#define SIZE 15



#include 

#include "student.h"



using namespace std;



class School{

        public:

                int read_list(Student list[], int size);

                bool open_file(ifstream &fin);

                void print_list(Student list[], int size);

                int search(Student list[], int);  

                int low_GPA(Student list[], int);

                int high_Units(Student list[], int);

        private:

                Student CS101[SIZE];

};



#endif

School Implementation

#include 

#include 

#include 

#include "school.h"



using namespace std;

int School::search(Student list[], int size){

        string        target;



        cout <<"\nPlease enter last name of student to locate:(all lower case) ";

        getline(cin, target);

        if (target.length()> 0){

                target[0] = toupper(target[0]); // convert first character to lower case

                for (int i = 0 ; i < size ; i++){

                        if((int)(list[i].get_Last()).find(target)>=0 )

                                return i ;

                }

        }

        else

                cout <<"No name was entered.\n";

        return -1 ;  // Student was not found on the list;

}



int School::read_list(Student list[], int size)

{

        ifstream fin ;

        bool        flag ;

        int i = 0 ;

        if (open_file(fin))

        {

                flag = list[i].readStudent(fin);

                while(flag && !fin.eof())

                {

                        i++;

                        if (i < size)

                                flag = list[i].readStudent(fin);

                        else

                        {

                                cout <<"\n*********** Array is full.\n";

                                break ;

                        }

                }

        }

        return i ;

}



bool School::open_file(ifstream &fin)

{

        string  f_name ;

        int                counter = 3 ;

        bool        flag = true;

        

        do{

                flag = true ;

                cout <<"Please enter input file name: ";

                getline(cin, f_name) ;

                fin.open(f_name.c_str());

                if (fin.fail())

                {

                        counter-- ;

                        cout <<"\nBad file name, you have "<< counter << " chances, try again.\n" ;

                        fin.clear();

                        flag =  false ;

                }

        }while (!flag && counter >= 0);

        return flag ;

}

void School::print_list(Student list[], int size)

{

        if (size > 0)

        {

                cout <
                cout << setw(50)<< "Name"<
                cout << setfill('-') << setw(100)<<"-" << setfill(' ')<
                for (int i = 0 ; i < size ; i++){

                        cout << setw(50)<
                        cout << setw(12) << list[i].get_Units() << list[i].get_GPA() << endl;

                }

                cout <
        }

}



int School::low_GPA(Student list[], int size)

{

        int lowIndex;

        float first, second, lowGPA = 5.0;

        if(size > 0){

                for (int i = 0 ; i < size ; i++){

                        first = list[i].CS101.get_GPA();

                        second = list[i+1].CS101.get_GPA();

                        if (first < lowGPA && first > 0.00){

                                lowIndex = i;

                                lowGPA = list[i].CS101.get_GPA();

                        }

                        if (second < lowGPA && second > 0.00){

                                lowIndex = (i+1);

                                lowGPA = list[i+1].CS101.get_GPA();

                        }

                        }

                return lowIndex;

        }                

}



int School::high_Units(Student list[], int size)

{

        int first, second, highIndex, highUnits = 0;

        if(size > 0){

                for (int i = 0 ; i < size ; i++){

                        first = list[i].CS101.get_Units();

                        second = list[i+1].CS101.get_Units();

                        if (first > highUnits){

                                highIndex = i;

                                highUnits = list[i].CS101.get_Units();

                

                        }

                        if (second > highUnits){

                                highIndex = (i+1);

                                highUnits = list[i+1].CS101.get_Units();

                        }

                        }

                return highIndex;

        }

}

Main/Driver

#include 

#include 

#include 

#include "student.h"

#include "school.h"

#define SIZE 15

using namespace std;





int main()

{

        Student CS101[SIZE];

        int size, index;

        

        ifstream fin;

        

        size = CS101.read_list(CS101, SIZE);

        CS101.print_list(CS101,size);        

        if(size > 0){

                index = CS101.search(CS101, size);

                if (index != -1){

                        cout << "You searched for: " << endl;

                        CS101[index].printStudent();

                }

                else

                        cout << "Student is not on the list.\n" ;



                index = CS101.low_GPA(CS101, size);

                if (index != -1){

                        cout << endl << endl;

                        cout << "The student with the lowest GPA is: " << endl;

                        CS101[index].printStudent();                

                }

                

                index = CS101.high_Units(CS101, size);

                if (index != -1){

                        cout << "The student with the highest number of units is: " << endl;

                        CS101[index].printStudent();                

                }                

        }

        fin.close();

        return 0;

}

Input File: student.txt

Joe

Smith Jr.

Electrical Engineering

45 3.45

Nancy Karen

Brown

Industrial Engineering

34 4.0

Adam

Jonhson

Computer Science

56 3.89

Gorden

Khalbandy

Mechanical Engineering

89 3.28

Alan

Jackson

Computer Science

34 3.95

Reading char strings and int data from text file

muffinhead — Thu, 19 Nov 2009 04:16:36 GMT

I'm writing a program that is supposed to be able to bubble sort data by name and by average. The data I'm given is student last name followed by 3 scores, all put into a text document. I'm to read the names and scores into their respective parallel arrays, and get the averages of the scores for each student put into a 3rd and final array. Looks like this:

Lastname 90 91 92

Lastname 80 81 82

This is the code I have for the read function:

int read(char filename[], char names[][30], int scores[][3], double averages[])

{

    int sum = 0;                        // the base of finding the average

    int numStu = 0;                     // how many students we will have

    int col = 0;                        // column for names

    // read text document

    ifstream infile(filename);      // define

    infile.open(filename);          // open

    

    for (int i = 0; i < 100; i++)

    {

        infile.getline(names[i], 30, ' ');  // get the name, stop when white space is found

        if (! names == 'z')             // no names start with lowercase 'z'

        {

            for (int j = 0; j < 4; j++)

            {

                infile >> scores[i][j]; // start plugging in scores

                sum += scores[i][j];    // while we're at it, get the sum of the scores

            }

            averages[i] = sum / 3.0;    // get the average for this name    

        }

        

        numStu = i;

    }

    infile.close();         // close

    

    return numStu;

}

This is the code for my write function (outfile stuff in comments because I'm trying to make this work with screen output first):

void write(char filename[], ios::openmode, char description[], char names[][30], int scores[][3], double averages[], int numberOfStud)

{

    // write to text file

    // ofstream outfile(filename, mode); // define

    cout << description << endl;

    

    for (int i = 0; i < numberOfStud; i++)

    {

        cout << names[i] << ' ';         // print the name

        cout << fixed << setw(7) << setprecision(2) << averages[i] << ' ';

                                         // then the averages

        for (int j = 0; j < 4; j++)

        {

            cout << scores[i][j] << ' '; // then the three exam scores

        }

        cout << endl;   // then go to the next line

    }

    

    // outfile.close();

}

I'm having a problem with garbage output. It comes up with long lines of irrational numbers, intersparsed with many 0's. I'm not sure what I'm missing here. I think the problem is located in the read function.

Finding maximum in a 10x20 2D array using rand()

jinjishu — Thu, 19 Nov 2009 04:01:16 GMT

I am currently stuck on part a of this problem. I am having a problem with my stub, I am also running this on visual C++ 2008 express. My stub is a program i had to create to find the maximum value from the 10x20 array. For some reason that's not setting up right. I will post y errors the compiler gave me, but my compiler also don't least lines for whatever reason. so the errors may not make sense, but i'll point them out as carefully as possible.

okay the official problem states this:

A. Write a function named findmax() that finds and displays the maximum values
in a two dimensional array of integers. The array should be declared as a 10 row
by 20 column array of integers in main() and populated with random numbers
between 0 and 100.

B. Modify the function written above so that it also displays the row and column
numbers of the element with the maximum value.

Here's what I have so far:

#include 

#include 

#include 

#include 

using namespace std;



int findMax(int[][20]);



int main()

{

        const int j = 10;

        const int k = 20;

        int i,u;

        int max;

        

        int grade[j][k];



        srand(time(NULL));



        for(i=0;i
        {

                cout << endl;

                for(u=0;u
                {

                        grade[i][u]=rand()%100;

                        cout << setw(4) << grade[i][u];

                }

        }



         findMax(grade);



        cout <<"The max value is " << max;



        system("pause");

                return 0;

}



int findMax(int grade[][20])

{

        int i, u;

        int j = 10;

        int k = 20;

        int max = 0;

 for(i=0;i
          for(u=0; u
         { if (max < grade[i][u])

                        max = max+grade[i][u];

         }

 

                 return max;

}

New Errors:

Run-Time Check Failure #3 - The variable 'max' is being used without being initialized.

So After the changes were made, the stub runs, but for some reason it isn't return my max to the int main. When I have it set to cout the maximum value it says the variable max wasn't initialized with a value.

crazy internet problem

mybluehair — Thu, 19 Nov 2009 02:53:59 GMT

Long story short, I'm using curl to download a file off my site. I've done tests and successfully downloaded a few txt files.

The main point, though, is to download an exe file. So I uploaded the exe file to my site, and downloaded it straight from my browser with no problems, and the exe ran fine. But when I tried downloading it with the curl program, it downloaded, yet exe was corrupt and crashed on start.

Any ideas from you smart guys? my theory is maybe its not downloading it binary-wise or something confusing like that. Any solutions? Thanks

Code:

#include 

#include 

 

void get_page( const char* url, const char* file_name )

{

  CURL* easyhandle = curl_easy_init() ;

 

  curl_easy_setopt( easyhandle, CURLOPT_URL, url ) ;

 

  std::FILE* file = std::fopen( file_name, "w" ) ;

  curl_easy_setopt( easyhandle, CURLOPT_WRITEDATA, file ) ;

 

  curl_easy_perform( easyhandle );

 

  curl_easy_cleanup( easyhandle );

}

 

int main()

{

  get_page( "http://*********.com/game.exe",

            "testfile.exe" ) ;

            system("PAUSE");

}

CHAR[] Help?

turtlez — Thu, 19 Nov 2009 02:32:41 GMT

Hello, i need help with a basic code issue, i ave posted the code here because it is too long to post...

The issue occurs in this section of code:
...(more before)
void getInput(int num){
char = one[1];
char = two[1];
char = three[1];
char = four[1];

...(more after)

saying it is expecting something before the keyword "char"
i am using Dev C++(Latest) as a compiler, and yes, i had i as the following at one point:

char[5]xxx;

((Example Variable))

Any and all help is appreciated.

Thanks

Set return issue with templated set.

Clockowl — Thu, 19 Nov 2009 01:51:54 GMT

Hey guys,

I have this code snippet:

template 

struct Delegate {

        virtual bool geef(const ElementType &element){

                pair ::iterator, bool> ret;  //this is line 196

                ret = elements.insert(element); //197

                return (ret.second); //198

        }

        

        virtual void output() = 0;

        

        set elements;

};



struct ArtiestenPrinter : public Delegate {

        virtual bool geef(const Lied &lied){

                bool nieuwElement = Delegate::geef(lied); // 210

                if (nieuwElement) {

                        cout << lied.artiest;

                }

                return nieuwElement;

        }

        

        virtual void output(){

                for(set::iterator it = elements.begin();

                        it != elements.end();

                        it++){

                        

                        cout << it->artiest << endl;

                }

        }

};

Which gives me these errors:

196: error: type/value mismatch at argument 1 in template parameter list for 'template struct std::pair'

196: error:   expected a type, got 'std::set >::iterator'

196: error: invalid type in declaration before ';' token

198: error: request for member 'second' in 'ret', which is of non-class type 'int'

210:   instantiated from here

197: error: cannot convert 'std::pair, bool>' to 'int' in assignment

I can't get my head around why the compiler is complaining, so any help is greatly appreciated.

Thanks in advance,

Need a task.. i can give reward for who solve this to me

FeVerSeCtioN — Thu, 19 Nov 2009 00:56:17 GMT

ok.. its really hard and takes time and knowlage of C++..
i hope i am in the right section for this.. if no please the mods move it to the right one..

Whoever manage to make over it... is god for me. i can give one premium rs account valid til 23 Octomber 2010 if anyone can make this.. please let me send the rs account only when the compiler runs it..
Its a program i need make at C - C++. it need make RSA algorithm with the following. all you have to do is complete where its empty with the codes of Encryption, Decription and Constraction of keys where it say "==== PUT YOUR FUNCTIONS HERE ====".
For any questions ask me here..

here is the code:

#include 

#include 

#include 

#include 





#define MAX_BITS 64 /* Max integer that will have 2^64 - 1 bits */

#define MAX_CHARS 100 /* Max character's number that get readed by fgets() */

#define LENGTH_P 9 /* Lenght of p in decimals */

#define LENGTH_Q 9 /* Lenght of q in decimals */

#define BLOCK_SIZE 8 /* will be cryptographed 8 ASCII characters by section */





/* For the constract of keys */



void NewSeed (void);

long long ModMult(long long a, long long b, long long mod);

int RabinMiller(long long candidate);

long long ModInverse(long long val, long long mod);



/* For the cryptography */

void GetBlock(char *block, FILE *fp, int numChars);









int main(int argc, char **argv){



   

}



/* ==== PUT YOUR FUNCTIONS HERE ====*/









/* *********************************************************************** */

/* *********************************************************************** */



void NewSeed (void){

   srand( (unsigned) time( NULL )); /* Seed = current time. */

}



/* *********************************************************************** */



long long ModMult(long long a, long long b, long long mod){

   /* Perform res = (a * b) % mod, avoiding intermediate overflow */

   long long res = 0;

   long long a1 = a % mod;

   long long b1 = b % mod;





   while(b1 != 0){

          if(b1 & 1)

                 res = (res + a1) % mod;

          

          a1 = (a1 << 1) % mod;

          b1 >>= 1;

   }

   return res;

}



/* *********************************************************************** */



/* Requires stdlib.h */

int RabinMiller(long long candidate){

   long long a, n, d, x, t, rem;

   int i, j;

   /* const int MaxBits = 64; */ /* Allow for a max int of 2^64 - 1 */

   int bits[MAX_BITS];

   int roundFailed = 1; /* Boolean */



   n = candidate;



   t = n - 1;

   for(i=0; i
          rem = t % 2;

          if(rem == 1)

                 bits[i] = 1;

          else

                 bits[i] = 0;



          if(t == 0)

                 break;



          t /= 2;

   }



   /* Main algorithm starts here */

   for(j=0; j<5; j++){ /* Perform 5 rounds against 5 random bases */

          a = (2 + (long long) rand()) % (n-1); /* Ensure 1 < a < n-1

          -- rand() produces smaller than n-1 for large n */

          d = 1;

          x = 0;

          for(; i>=0; i--){

                 x = d;

                 d = ModMult(d, d, n);



                 if(d == 1 && x != 1 && x != n - 1)

                        roundFailed = 1;



                 if(bits[i])

                        d = ModMult(d, a, n);

          }



          if(d != 1)

                 roundFailed = 1;

          else

                 roundFailed = 0;



          if(roundFailed)

                 return 0;

   }

   /* If this point has been reached, then the candidate number has passed

   all rounds successfully. */

   return 1;

}



/* *********************************************************************** */



long long ModInverse(long long val, long long mod){



   long long c1, c2, c3, t, b1, b2, b3;

   int sign = 0;

   c1 = mod;

   c2 = val;

   c3 = 0;

   b1 = 0;

   b2 = 1;

   b3 = 0;

   t = 0;



   do{

          t = c1 / c2;

          c3 = c1 % c2;

          b3 = t * b2;

          b3 = b1 + b3;

          c1 = c2;

          c2 = c3;

          b1 = b2;

          b2 = b3;

          sign++;

   }while(c2 != 0);



   if(sign % 2 == 0)

          b1 = mod - b1;



   return b1;

}



/* *********************************************************************** */



/*

Reads numChars from file pointer fp and stores them to block.

if there are less than numChars characters, pad out with spaces

*/

void GetBlock(char *block, FILE *fp, int numChars){

   int i = 0, charsRead = 0;

   char c, str[BLOCK_SIZE+1];



   while((c = fgetc(fp)) != EOF && i < numChars){

          if(c == '\n')

                 continue;

          str[i] = c;

          i++;

   }

   charsRead = i;

   if(c != EOF) /* There are more chars in the file, but the block is full */

          ungetc(c, fp);



   if(charsRead < numChars){ /* Need to pad out with blanks */

          for(i=charsRead; i <= numChars; i++)

                 str[i] = ' ';

   }

   str[numChars] = '\0'; /* Add string terminator */

   strcpy(block, str);

}



/* *********************************************************************** */

Write 4 functions to compute and return

guccitan88 — Thu, 19 Nov 2009 00:29:04 GMT

Hi, new learner to C++. I have to write 4 functions to compute and return the diameter, circumference, etc. of a circle. I think I might be on the right track but I'm probably making this harder than it has to be. I commented most code out because I'd like to get one thing working and then go back and finish. How do I get the radius value into the equation? When I run it the answer comes up
-1.#IND when I put in a radius of 2.

#include 

#include 

#include 

using namespace std ;



double radius ;

double diam ;

double const PI = 3.14159265358979323846 ;





double diameter(double diam)

{

        double d ;

        while (d = 2 * radius ) 

        return d ;

}



//double circum(double circumf)

//{

//        return diam * PI ;

//}

//

//double area(double area1)

//{

//        return PI * pow(radius, radius) ;

//}

//

//double volume(double vol1)

//{

//        return (4.0/3.0) * (radius * radius * radius) * PI ;

//}







int main()

{

        double radius ;

        

        cout << "Please enter the radius of a circle: " ;

        cin >> radius ;



        double d = diameter(diam) ;

        cout << "The diameter of the circle is: " << d << endl ;



                

        /*circum(circumf);

        cout << "The circumference of the circle is: " << circumf << endl;



        area(area1);

        cout << "The area of the circle is: " << area1 << endl;



        volume(vol1);

        cout << "The volume of the sphere is: " << vol1 << endl;*/







return 0 ;



}

Thank you!

String assigns not permanent

Clockowl — Thu, 19 Nov 2009 00:21:34 GMT

Nevermind.

Arithmetic operations

maverick405 — Thu, 19 Nov 2009 00:18:33 GMT

This program runs perfect just want to know if I have to do this arithmetic operations using functions how can I do that?

// Arithmetic.cpp - This program performs arithmetic, ( +. -, *. / ) on two numbers.

// Input:  Interactive

// Output:  Result of arithmetic operation



#include 

#include 

#include 



using namespace std;

int main(int argc, char *argv[]) 

{

   double numberOne, numberTwo;                      

   string operation;

   double result;         



   cout << "Enter the first number: ";

   cin >> numberOne; 

   cout << "Enter the second number: ";

   cin >> numberTwo; 

   cout << "Enter an operator (+.-.*,/): ";

   cin >> operation;

                

   if (operation == "+")

   {

          result = numberOne + numberTwo;

                 }

          else if (operation == "-")

   {

          result = numberOne - numberTwo;

                }

          else if (operation == "*")

    {

          result = numberOne * numberTwo;

              }

          else if (operation == "/")

    {

          result = numberOne / numberTwo;

             } 



          cout << numberOne;

          cout << " " << operation << " ";

          cout << numberTwo;

          cout << " = ";

          cout << result << endl;



system("PAUSE");

return EXIT_SUCCESS;

} // End of main() function

Linear and Binary search

rafta — Thu, 19 Nov 2009 00:02:51 GMT

Iam trying to code a single program of an array with 20 elements in it. It asks for a number from user and search is if this array has that number.

I am using Binary and selection search.

Its not giving me the required results. here is my code;

/* Linear and Binary search





*/



#include 



using namespace std;



// Function prototype



int searchList(int [], int , int );



int binarySearch(int [], int, int);



 const int size = 20;



int main()



{

int tests[20]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20};



 int num1, num2;

 

int result1, result2;



//search the array for 19



result1 = searchList(tests, size ,19);





// if searchList  returns -1 , then num1 is not found

cout << "Enter the number you wish to search for: ";

cin >> num1;

   if (result1 == -1)

   {

       cout<<"There is no num1 "<
   }

   

   else 

   {

       cout << "num1 is found"<
       cout <<"and its position is =";

       cout<< (result1+1)<
       

   }

    // calling Function for Binary search

    

result2 = binarySearch(tests , size, 19);

    

cout << "Enter the number you wish to search for: ";

cin >> num2;



       if (result2 == -1)

       cout << "That number does not exist in the array.\n";

       else

       {

           cout << "That ID is found at element " << result2;

                cout << " in the array.\n"; 

                } 

   

   

system("PAUSE");

    return 0;

}



/*

**************************************



 void displayList( int [], int)



 {

 

 

 }



/**********************************************************/



/*SearchList Function performs a linear search. Array  name is list 

and it has a max numElem elements . 

if the number  is found 

If the number is found, its array 

subscript is returned. Otherwise, -1 is returned. *

****************************************************************

*/



int searchList(int list [], int numElem, int value)



{

    int index =0 ;

    int position = -1;

    bool found = false;

    

    while (index < numElem && !found)  

    

    {

        if (list [index]== value )  

        {

                found = true ;

                 position= index;

        }  

          index++;

    }



return position;

    

}



//********************************************************************

/* The function should keep a count of the

number of comparisons it makes until it finds the value. 





//***********************************************************************

/* Function for  Binary search*/



int binarySearch(int array[], int numElems, int value)

{

    int first = 0,           // First array element

        last = numElems - 1,    // Last array element

        middle,        // Midpoint of search

        position = -1; // Position of search value

        bool found = false;     // Flag



while (!found && first <= last)

{

        middle = (first + last) / 2; // Calculate midpoint

}        

        if (array[middle] == value) // If value is found at midpoint

                {

            found = true;

            position = middle;

                }

  else if (array[middle] > value) // If value is in lower half

        {

                last = middle - 1;

    }

 else

    {

    first = middle + 1;        // If value is in upper half

      }

return position;

}

Splitting up a string

wyett — Wed, 18 Nov 2009 23:56:30 GMT

So, I'm asking a user to input a fraction in the form of this:

+3 3/4

I know I can use a search to find where the first instance of something happens, but how do I actually take whats before it? Example: I can tell it to search for white space, but how can I tell it to grab what is before it and save it into a variable?

Would it be easier to use an array of characters or can a string work?

convert string w spaces to an array w/o spaces

mampam — Wed, 18 Nov 2009 22:53:12 GMT

Hi, I am having a user input a series of numbers and characters separated by spaces. like "10 23 65 34 765 34 65 34 64 354 64" and i need to put these into an array without the spaces. I stores them into a string but whenever i do like

 mystring[0]

i only get the first digit and not the number. or if i put

 mystring[1]

i only get the second number like in the digits above. i want

 mystring[0]

to contain 10 and not just 1.
Please help!!!!!!

Lotto array program with void function

vinochick — Wed, 18 Nov 2009 21:52:19 GMT

I have to write a program that allows a user to pick five numbers from one to 55. The computer will then generate 5 random numbers and determine how many of the users choices match the generated numbers. I have to create an algorithm for this program. The program will have a void function to generate 5 random numbers from one to 55, no duplicate numbers allowed. The random numbers and the choices will be stored in two one dimensional arrays. The program will have a void function to display the random
numbers and the users choices and the number of matches. The program will contain a loop that will generate a new set of random numbers and user choices unless the user tells the program to quit. I don't even know where to start with this. The void function is what I'm not getting mostly.

HELP Me Plz

ImMoRtAl- — Wed, 18 Nov 2009 21:42:51 GMT

Please
ok can any one give me the code to this im making a program and it needs this and im stuck please give code asap
application that will convert any text I throw at it to hex
Thank You