51,593 Topics
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| | I use rand() to generate random numbers between 0-50. However when I use the code, as I have seen it, rand() doesn´t truly generate random numbers. It seems that everytime I restart the application, it generates the same random numbers everytime. It seems that there is any mathematical sequence the … |
| | In all of the projects I've created in my college classes I've always declared the variables that will be used in multiple methods (passed by reference) in my main method and then passed as needed, allowing for the main method to be nothing more than a control for what variable …  |
| | If I have a backgroundWorker that has executed like this: [code] backgroundWorker2->RunWorkerAsync(); [/code] If I now want to cancel this, I have put this line of code at the very last line in the _DoWork event of the backgroundWorker2. I am not sure if that works or if it is … |
| | Hello, If I have code like such: [code=c++] map <string, map <string, int> > foo; map <string, map <string, int> >::iterator bar; [/code] How to access the value of the nested map? Normally I access a map's value like such: [code=c++] bar->second; [/code] To that end, I tried doing this … |
| | if we use queue from c++ stl, we don't need //void enqueue(struct queue *q, int a) //int dequeue(struct queue *q) functions? my TA has it on the slides but since the c++ queue has push and pop enqueue and dequeue isnt needed, right? |
| | Does anyone know how to delare a managed class in unmanaged code? This is driving me nuts, because I can call unmanaged from managed, but not the other way. Is there a way to do this? Thanks in advance. I want this for example: class foo { public: //other code …  |
| | hii all, im trying to connect remote sq server using in c++ using CDatabase class. im getting an sql error Connection Failed SQL State '01000' SQL Server Error 14: [Microsoft][ODBC SQL Server Driver][DBNETLIB]ConnectionOpen (Invalid Instance()). SQL State '08001' Connection Failed SQL Server Error 14: [Microsoft][ODBC SQL Server Driver][DBNETLIB]Invalid connection the …  |
| | i am working on image processing , which intially i used to do using MATLAB . but now i have been told to do using using JAVA or C++ programming ,. Since i know the fundamentals of C++ i guess i would be the right choice But the problem is …  |
| | I wish to parse an xml file but after a lot of reading, am confused by the various compilers available for for it. What would be the best way to parse an XML file and what sort of compiler/parser would you use for it? |
| | can anyone help me with this output: ^^^^^#^^^^^ ^^^^###^^^^ ^^^#####^^^ ^^#######^^ ^#########^ ########### i have done the following so far & am struggling to continue: #include <iostream> using namespace std; //Function draw shape void displayRow(int sizeP) { for(int i = 1; sizeP - i + 1; i++) cout << '^'; … |
 | idk why i get this error i just do here is the code i have: [code=c++] #include "includes.h" int main() { } [/code] here is the error: c:\documents and settings\tom\my documents\visual studio 2008\projects\c++ tutorial\c++ tutorial\main.cpp(3) : error C2143: syntax error : missing ';' before 'int' any ideas? |
| | string rating(bool ozone, bool no2, bool so2) { string result; int count = 0; if(ozone == true) { count++; } if(no2 == true) count++; if(so2 == true) count++; if(count == 3) result = "Gold Star"; if(count == 2) result = "Silver Star"; if(count == 1) result = "Ok"; if(count == … |
| | HI, I'm trying to write an application in C++ that has two things - a TCP server (listen server) as well as a TCP client where it can send to other TCP servers. I currently have both parts set up simultaneously. I did this by calling fork() and having the …  |
| | Im suppose to read in a file (which it isn't doing) and get numbers form them to see if they pass or fail certain specifications. Can someone help? the exact specifications are: The company you work for, Acme Environmental Monitoring, runs sensors to test air quality at different locations. These … |
| | Hi, I am not that great with C++ but I am trying to write code that will be able to import 2 wave files I have - the first file is my sine wave sweep file the second is my impulse response of the room. Once imported I wish to …  |
 | Hi all, i asked this question a few days ago bit its still unsolved. I'm reading a text file of strings, line by line, and storing them into an array. when i try and print them using this function: [CODE=cpp]template < typename T > void printArray(T * const array, int … |
| | Hello everybody! I am creating a Book library system in C++. I created a login class where the user types in a username and password and if successful is able to log into the menu system. Now, everything goes well unless and untill the user types in the right credentials … |
| | Does anyone know how to use let the user define a custom hotkey with the control IDC_HOTKEY, then register it on a system wide scale, so it sends a message back to the application when its pressed? And I have googled, without much luck. |
| | What is the platform independent method to get functionality provided by windows.h? |
| | Hi all, I've been instructed to write a program that inputs a dollar amount to be printed on a check, and then prints the amount in a check-protected format with leading asterisks of necessary. Nine spaces are available fore printing an amount (max of $99,999.99). The program looks like this: … |
| | Help please! How do I change this so I input the letters instead of numbers? I'm confused. I want to make it so I can enter "R" instead of "0" etc. Also, I don't know where to put an if-break for the user to enter "Q" or "q"... [code] #include … |
| | Okay, I'm trying to have a linked list autonomously delete itself, however, the destructor function I am using doesn't seem to work, it just keeps constantly looping, until the program just ends itself. Here's the function: [CODE]node::~node() { if(this->next != NULL){delete this->next;} delete this; }[/CODE] Basically, this should run through … |
| | Can i make a function with a vector<int> parameter instead of an int array?  |
| | I have a struct. I want to declare a pointer to that struct. Now I want 10 of those structs. How is this declared? I have tried (call the struct foo for example): foo* test[10]; when I make a call to test[0]->whatever or test[5]->whatever it seems to always write to … |
 | This simple example fills a vector with numbers 0-9. Then I use find() to find where the 7 is. Then I saw online you can get the index by simply subtracting V.begin() from the iterator that find() returns. Has - been overloaded for iterators to do some magic and return … |
| | Hi, I'm trying to code a program that involves a double linked list. I have the linked list working but the information in the link list need to be shared between 2 different classes. Is it possible to pass a linked list as reference and manipulate it within the different … |
| | ok so i am going to be taking a c++ course next semester and was wanted to get better knowledge so i have a proble that i was givin that am having some trouble, just some pointers on where/how to start will be helpful... Im not sure how to set … |
| | hi guys, i downloaded eMbedded Visual C++ 4.0 and when i run setup.exe it asks for a serial number, where can i find it? thanks |
| | For a project I am working on we're using libserial to communicate with out hardware. the problem with libserial is that when you call read() it returns an unsigned char and readline() returns a string. We're encoding our collected data from four sensors into 32 bit unsigned integer if I … |
| | Hey guys I am having a problem knowing where to start on writing this Leap Year program that wants a day number output. Here is the scenario: Write a function [I]dayNumber[/I] that returns the day number (1 to 366) in a year for a date that is provided as input … |
| | I was using a library recently and I was getting a "undefined reference" linker error when I tried to call a template function with a type that they did not plan on me using. I asked on the mailing list and they said to call [code] VSL_VECTOR_IO_INSTANTIATE(vnl_matrix_fixed<double,3,3>); [/code] I guess … |
| | A question/curiosity: When using the time function, why must the argument be 0, as "time(0)"? I tried other numbers and it gave error. |
| | Hi, I am comparing two file to find if they have common strings. My program is not doing that and I cannot figure out the reason. Any help is appreciated. Following is my code: [CODE]int main() { FILE *inf1 = fopen("file1.txt","r"); FILE *inf2 = fopen("file2.txt","r"); int numcols = 11; char … |
| | i've got this last year question from my senior. i've tried to solve it on my own but i think it's not suit with level now. so, anyone please could help me to write the codes as my final exam is coming soon. kindly post the solution through this site … |
| | hello, I've been pondering on a thing here for while now. The thing is that I want to read in several of integers, which I've fixed. And the problem now is that I want to output the integers I have input. The thing is that I only want to output … |
| | hi i really need help i am really lost in this program if any one can help me with it plz contact me on my email [I] <<mail id snipped>>[/I] (using c++ program) 1. Write a computer program that implements the recursive merge sort. The input to the program must … |
 | Hi I just finished reading C++ the complete reference by herb schildt (almost a quarter ago)so i feel i can program in c++ but i don't know what to write.could you give me some problems that their answers involve a lot of c++ features? thanks a lot |
| | I am trying to write a math tutoring program for students. A very basic outlay of ceretain components. This program should have the user select addition, subtraction, multiplication or division. user should also have the capeability to exit the program and quit it. I tried writing some code for this, … |
| | I have to write a class for a new "home-made" string class, and I do not know how to attack the operator>> . I will provide my class constructor and what i tried... [code] String::String( const char A[] ) { char X = A[0]; int pos = 0; Length = … |
| | I'm trying to write a simple deque program that lets you add/delete numbers and display them at will. The code is as follows. User.cpp: [code] #include <iostream> #include "Doth.h" using namespace std; int main() { char choice='m'; int n; Deque call; while(choice!='q'||choice!='Q') { cout<<"Menu:"<<endl; cout<<"[A] Add to the front"<<endl; cout<<"[B] … |
| | does anyone have a function laying around to secure delete a file from the hard disc with X passes of random data? ive been trying to find this code forever on google, and everything I have found has just been skimpy .NET programs |
| | I am working on a program and need to make a friend, deconstructor, and copy constructor..... I was given this formula for the destructor and completely confused... cout << value1 << value2 I also do not seem to see a whole lot of information on copy constructors and friends so … |
| | 0x241f8e0 0x241f8e4 0X241f8e8 0x241f8ec 0x241f8f0 0x241f8f4 0x241f8f8 0x241f8fc 0x241f900 0x241f904 After printing adress of a 2D Array of size 2x5... this is the out-put printed...can someone help mi with explaining the trend.....Is it something like printing consecutive memory blocks??? please help mi out of my confusion..... thanks in advance for …  |
| | Let say I have a line for numbers 2 4 5 8 7 9 1 3 and i want to sort them in numerical order how would i do this? I found a similar topic but it was of no help someone said to do bubble sort and then everyone … |
| | O.k guys the reason for the new thread because no one understood the previous thread even I didn't understand what I wrote lol! Now listen to my problem. I wrote an exe file that loads a dll and than uses a function from inside of the dll! BUT!! my exe … |
| | Dear All, I want to open another exe file in my C++ program. Let the exe file be A.exe. So I used shell execute inside my C++ program to open the file but as A.exe writes in a file certain data that I will use in the next step of … |
| | OK so I got my executable file that should load all the functions from "message.dll" so I can use them. But every time I run my executable file I am getting an error that say my executable is encountered problems and its should be closed than its being closed. Here … |
| | Alright, I've started learning array recenetly and have to write a program using them. I am having problems getting started on it, the notes we received seem very unclear. Here is the link to the instructions I have to use. [url]http://www.cs.niu.edu/~abyrnes/csci240/pgms/240pgm7.htm[/url] Basically I just want some pointers to get me … |
| | I am writing a program to record score of a cricket match. One array stores information of batting teams and the other array stores information of bowling team. The program has to read the information of the teams and depending upon the user’s choice, it must displays either the batting …  |
| | Hi there, Can any one help me, I am trying to import a wave audio file apparently I have to remove the header file or something like this can any one advised me please. |
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