Posts by Ancient Dragon

see these google links. Make sure whatever you decide to do that the course(s) are accredited. Talk to your school counseler about whether the courses are transferrable or not because many of them are not unless you get the bachelor's degree with that institution.

>>for(int i=1; i<(cnt-2); i++)
you don't need that cnt counter. Just delete it

lines 25-30 are reading the file again, not writing to it. Close fin before that loop

fin.close();
fout.open("filename");
for(int i = 0; i < lines.size()-2; i++)
   fout << lines[i] << "\n";

if ( !fout.fail() )
    { // if began
       fout << p->Objperson.nombre << endl; 
       fout << p->Objperson.ss << endl;
       fout << p->Objperson.edad << endl;
    } // if end

That should be a while loop. Also your program will be a little more efficient if you do not use endl because endl does more than print '\n'.

while( p != NULL)
{
       fout << p->Objperson.nombre << '\n'; 
       fout << p->Objperson.ss << '\n';
       fout << p->Objperson.edad << '\n';
    p = p->next; // or whatever pointer you use in that structure
}

look at line 13 of the *.cpp file then compare it with line 30 of the header file. The first parameter of the function in the *.cpp file does not match the parameter in the header file.

Also, the cpp file must declare the class name

void Football::SearchMatches(Match* matches,int size,string TeamName)
{

  // blabla
}

There is no difference between structures and c++ classes other than default access. Unions are the same as they are in C -- all members of a union occupy the same memory location.

>>classes and their associated components are instantiated in memory in pretty much random order, but structs and unions are instantiated in a fixed order? Is this true?
I don't know -- never heard of that. Both structure and class objects should be allocated in the order in which they are declared. If allocated dynamically then the memory will be in some memory that is unknown to the program (the memory allocation functions will of course know).

maybe you should post that question in the Shell Scripting tech board

That sure is an interesting link -- the comments by posters are more interesting than the original blog writer.

I made the change suggested. Following is the code. It is not able to delete the first three lines:
I am not able to find what is wrong.

That's because the file was opened for read, therefore writes will fail. You need to use two fstream objects. 1) ifstream to read from the original file, and 2) ofstream to write to a new temporary file. Here is some psudo code.

open input file 
open output file
for each row in the input file
    if counter > 3 then write to the output file
end of while loop
close both files
delete the original file (using remove() function)
rename the temp file to the same filename as the original (use rename() function)

i also wish to delete the last three lines of a file.. should i use c++ program or a unix script

what did your teacher tell you to do. write a c++ program or write a unix script?

line 8: you might as well delete it because the compiler will delete it when you compile the program for release mode. Instead of using assert, just test as normal

if( !foud.is_open())
{
    // open failed
}

line 10: don't use eof() like that because it doesn't work that way. Here's the correction

while( getline(fout,temp) )
{
    // blabla
}

line 26: >> /* End of writing to a file */
You have done no such thing!

Ok so now you have read in the file into the linked list. Now you have to add code to rewrite the file.

I think the process that creates the shared memory must stay alive until all other processes are done using it. When the creating process dies the os deletes the shared memory. Here is a description for Solaris, which is probably identical to the work I've done with IBM unix.

But, I could be wrong about that too.

I never use the else in a statement like that. But there really is nothing wrong with it because a good optimizing compiler will probably delete the else anyway.

Those ACM links are probably pretty useless to the OP. Not unless he has a Masters or Ph.D. in computer science or something which I doubt.

Sorry, but that is absolute nonsense!

As a freelance journalist myself I can assure you that asking experts for comment/research which is then quoted within the context of a piece, and duly accredited as such, is most certainly not illegal, unethical or anything other than normal working practise.

Agree -- If that were illegal or unethical I don't think there would be any books written that does not contain original thought :)

Well, how do we get the questions and how to we respond to them ? If you post the questions here we can either post our answers or sent you PM with the answers. I know DaniWeb normally does not allow answers via PM but this may be a special case because the answers may contain confidential information that should not be publically posted.

I tried to upload a *.zip file in this thread (post #28) and it failed. I thought zip files were acceptable.

Here are the files I compiled in .zip form. Just use winzip to uncompress them in the directory of your choice.
[edit]DaniWeb will not upload *.zip files, so I changed the filename to *.txt. After you download it, change the file back to *.zip and use winzip on it.[/edit]

I did do as you said anyway now. I opened the .cpp and .hpp files in the browser and saved these files as textfiles. The project compiles except for the .ccp file.

That was a huge mistake. When you download the three files you have to click the Save button in the download window, not open it with the browser. From what I see in the text files you posted your browser added a lot of html code to the files that the c++ compiler doesn't know how to handle.

I download all three files and successfully compiled with with VC++ 2008 Express after making a couple changes.

• name a.cc to a.cpp
  
• have to add #include <limits> to each of the two *.cpp files
  
• VC++ 2008 Express does not recognize and and or, so add these macros after the includes in each *.cpp file

  #ifndef or
  #define or ||
  #endif
  #ifndef and
  #define and &&
  #endif

Here is the datafile.cpp that I get with the link posted by Duoas in post #17. As you see stdafx.h is not included here. I deleted most of the code to show only relevent parts. If there is a more recent copy then you should post it. Those text files you have posted are worthless because they are unreadable. Post the *.cpp file.

// datefile.cpp
// Copyright (c) 2008 Michael Thomas Greer.
//
// Boost Software License - Version 1.0 - August 17th, 2003
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF …

your project is using precompiled headers so the first line after the comments at the top of the *.cpp file must contain #include "stdafx.h" . If it doesn't eppear on the first line, add it.

How exactly does the code you posted attempt to solve the problem ? Answer: it doesn't -- the code is for a completly different homework problem.

Do the requirements one at a time. Your first task is to create a structure that contains three items: last name, first name, and id. After that write a program with a loop that lets you enter each of those items and add a new structure object to an array of structures.

>>if( (s_current.compare(struct_filedata.name) && s_parrent.compare(struct_filedata.name)) )

use || operator instead of && because it can't be both at the same time.

you must have something else wrong because your function compiled ok for me. All I did was make it a simple function and declare the vector globally.

#include <iostream>
#include <string>
#include <io.h>
#include <vector>
using namespace std;

vector<string> m_vFilenames;
int MakeList(string p_sPath)
{
	cout << "Parameter: " << p_sPath << endl;
	struct _finddatai64_t struct_filedata;
	string s_filename = p_sPath + "\\*.*";
	string s_current = ".";
	string s_parrent = "..";
	
	cout << "Listing " << s_filename << endl;

	long nHandle = _findfirsti64(s_filename.c_str(), &struct_filedata);
	if(nHandle >= 0)
	{
		while(_findnexti64(nHandle, &struct_filedata) == 0)
		{
			if(struct_filedata.attrib & _A_SUBDIR)
			{
				if( (s_current.compare(struct_filedata.name) && s_parrent.compare(struct_filedata.name)) )
				{
					s_filename = p_sPath + "\\" + struct_filedata.name;
					cout << "Subdir found: " << s_filename << endl;
					MakeList(s_filename);
				}
				else
				{
					cout << "Dir found: "  << struct_filedata.name << endl;
				}
			}
			else
			{
				cout << "File found: " << struct_filedata.name << endl;
				m_vFilenames.push_back(struct_filedata.name);
			}
			
		}
	}
	else
	{
		cout << "Path not found." << endl;
		return -1;
	}


	return 1;
}

int main()
{

}

>> Where does WinAPI fit into all this
That is the Windows operating system functions. OpenGL, DirectX, etc are wrappers around win32 api functions. You can do windows graphics without OpenGL or DirectX, but you can't do OpenGL without the WinAPI.

We have cameras at work too but I normally ignore them, just do my job. The cameras are there for customer theft, and they do work/record all the time.

I believe both -- God created everything, how he did it was through evolution.

If this is the original function

int foo(int x)
{
    while(x < 10)
      x = x + 1;
   return x;
}

Then you can do this:

int foo(int x)
{
    if(x < 10)
    {
        x = x + 1;
       foo(x);
    }
    return x;
}

int try(int *add)
{
	if(add()>10)
           try(sub);
}

That does work because the parameter to try() is not a pointer to a function. This should fix the compile error.

int try(int (*fn)() )
{
	if(add()>10)
           try(sub);
}

>>@ AD: can u please post the source code and the file u compiled on here ? I use dev-c++ too and doesnt work ><
I used exactly the same source code that appears in post #7 in this thread, except I fixed the void main. I didn't use a data file so it didn't actually read anything. But the program didn't crash as niek_e suspected.

line 155: >> matches[matchesCounter].Season

matches is an array of unallocated pointers, so you have to use the pointer operator, like this: matches[matchesCounter]->Season Before you can do the above you have to allocate memory for the structures. Here's how:

int matchesCounter=0;
	while(!inFile.eof())
	{
		//read season
                matches[matchesCounter] = new Matches; 
		getline(inFile,Buffer);
		matches[matchesCounter]->Season = Buffer;
		//read team1 name
		getline(inFile,Buffer);
		matches[matchesCounter]->Team1 = Buffer;
		//read the "over" string
		getline(inFile,Buffer);
		//read team2 name
		getline(inFile,Buffer);
		matches[matchesCounter]->Team2 = Buffer;
		//read result
		getline(inFile,Buffer);
		matches[matchesCounter]->Result = Buffer;
		//read the empty line
		getline(inFile,Buffer);
		//update the matches counter
		matchesCounter++;
	}

you can simplify like this:

int matchesCounter=0;
	while(!inFile.eof())
	{
		//read season
                matches[matchesCounter] = new Matches; 
		getline(inFile,matches[matchesCounter]->Season);
		//read team1 name
		getline(inFile,matches[matchesCounter]->Team1);
		//read the "over" string
		getline(inFile,Buffer);
		//read team2 name
		getline(inFile,matches[matchesCounter]->Team2);
		//read result
		getline(inFile,matches[matchesCounter]->Result);
		//read the empty line
		getline(inFile,Buffer);
		//update the matches counter
		matchesCounter++;
	}

I just compiled and ran your program in Dev-C++ and the window didn't close on me. I also ran it from command prompt and it worked there too.

you have to put a line at the end of main() to keep the window from closeing. Add a getchar() will do it.

If you have a lot of classes that can be used in several different projects then put the classes in a library or DLL. That way you only have to complie the classes once. Then you tell the compiler to link the application program, that includes main(), with the library. One way to do that is use the #pragma directive

// main.cpp
#include <string>
// other includes here

// force the compiler to link with your library
#pragma comment(lib,"mylib.lib")

>> If for instance u have 20 classes, u write all the code(classes) in the same environment, that in the same cpp file???

No. Each class can be in its own *.cpp file, and all the *.cpp files can be in the same project. A project can contain as many *.cpp files as you want. And in Visual Studio projects and contain other projects.

Go to menu Tools --> Editor options, then select the General Tab. In the lower right-hand side is where you set the tab size. But you may also have to turn off Smart Tabs

Instead of using the loops to initialize the array, you can also do it when the array is declared, like this: float a[M][M] = {0}; The above will initialize all elements of the array to 0.

you opened the file for reading, not writeing.

but i still want to be able to use string uri50?!!

What I posted doesn't prevent you from doing that. All it does is provide a "" value when the calling function omits that parameter.

Line 56 would then become: ipuri.ip_uri(ip50);

you can give it a default parameter of a blank string
line 12: string ip_uri(string ip50, string uri50 = "");

Don't expect any mod to answer questions via PM -- we don't. Post all questions on one of the DaniWeb boards.

And I moved this thread to a more appropriate board.

Don't be afraid to make liberal use of { and } braces. And pay attention to spacing. Both these will help you greatly in understanding the logic of your program.

if ( Size < MAX_SIZE )
{
    Data[ Size++ ] = NewData;
}
else
{	
    // Only the five recentmost numbers are subject to testing
    // so, drop the first and pushback the rest, and insert
    // newest element into spot five.
    for ( Index = 0 ; Index < MAX_SIZE - 1 ; ++Index ) 
   {
               Data[ Index ] = Data[ Index + 1 ];
   }
   Data[ MAX_SIZE - 1 ] = NewData;
}

well you can write empty functions for now and implenent/test them one at a time. Don't try to code them all at one time or you will just get overwhelmed by all the compiler errors that you will get. As another DaniWeb member said (I don't recall who), use the Divide And Conquor method. Do one function at a time and soon you will have the program complete.

va_args will be of no help to you because all it does is point to the beginning byte of the stack where a variable of unknown size starts. The program still has to know the data type.

This is how I impleneted a general-purpose linked list

typesed struct node
{
    void * data; // data for this node
    struct node* next;
    struct node* prev;
} LINK;

To insert a node at the head of the linked list.

struct node* insertHead(LINK** head, void* data)
{
      LINK* newNode = malloc(sizeof(LINK));
      newNode->data = data;
      newNode->next = NULL;
      newNode->prev = NULL;
      if( *head == NULL)
           *head = newNode;
     else
     {
         newNode->next = *head;
         *head = newNode;
     }
}

>>Will this do the job?
Don't know -- why don't you compile and test it to see if it will work correctly. add a print statement on every insertion to see if the array was shifted correctly.

Here is how to extract all email addresses on a single line. It just keeps find the @ symbol until no more can be found. Once the @ symbol is found this program erases the address from the line and looks again for another @ symbol.

#include <iostream>
#include <string>
using namespace std;

int main()
{
    // list of all valid email characters.
    string chrs = "-_.abcdefghijklmnopqrstuvwxyz123456890";
    // a line that contains two email addresses and some other stuff
    // Assume the emails below are fake -- I don't know if they are real or not.
    string line = " here at cscgal@daniweb.com and here too happygeek@daniweb.com";
    size_t pos = 0;

    while( (pos = line.find('@') ) != string::npos)
    {
        string st = line.substr(0,pos);
        line = line.substr(pos);
        for(size_t e = st.length()-1; e >= 0; e--)
        {
            char c = st[e];
            if( chrs.find_first_of(c) == string::npos )
            {
                st = st.substr(e+1);
                break;
            }
        }
        if( (pos = line.find(' ')) != string::npos)
        {
            st = st + line.substr(0,pos-1);
            line = line.substr(pos+1);
        }
        else
        {
            // end of line found, so just empty the string
            st += line;
            line = "";
        }
        // print the email address
        cout << st << "\n";

    }

}

that first, outside loop is wrong.

string lineFromFile;
while( getline(fin, lineFromFile) )
{

   // blabla
}

puts() adds the '\n' to the end of the string. call printf() instead printf("SHELL>"); >>In the past time, i've been used terminal libraries like the infamous conio.h in turboc
That is what you get for learning ancient and obsolete version of C compilers. They teach you very bad habits that are sometimes difficult to unlearn.

>>ifstream ReadFile("C:\\File1.txt");
That is text mode. Here is binary mode: ifstream ReadFile("C:\\File1.txt", ios::binary);

yes, ODBC is one way, and is supported by most, if not all, modern SQL compliant data bases. There are already several free odbc c++ classes. So what you are trying to do has already been done several times in the past 10 or so years.

For MySql specifically, you can download free MySQL++.

>>Thank you. I will look the seekg() method up in msdn.
You might find it there, but that is a standard c++ fstream function. Look here instead.

By anime, do you mean animated ? If yes, the last one I watch and enjoyed was Ratatouille