Using multiple source codes

before you say it ive looked at the FAQ and i still have a question.

how do i use one source code for the main program but use functions from the other source code

i thoughtmaybe a header file would do it but im not sure.

Thanx for your help.


quick side question does ne one know a good console game code site? (if that made ne sense)

Yes, a header file will do it. For instance:

Code:

In Main.cpp:
#include "functions.h"

int main()
{
   PrintA();
}

In Functions.h:
//declare your functions
void PrintA();

In Functions.cpp:
#include <iostream>
#include "functions.h"
//define your functions

void PrintA()
{
    std::cout << "A" << std::endl;
}

awesome this will help my project tons.

it can be useful to do it if you have long source code but normaly I don't do it

ive just started coding and its close to ten pages because of functions its way too clustered.

i do have a question stoill tho in your supporting source codes do you have to have a int main() and if so what do you put into it?

There should only be one main function in the project as a whole.

There should only be one main function in the project as a whole.

right so the supprting source codes with the functions in them dont need int main. only the source code that runs the program.

am i understanding right?

Another queston in the source code that im defining my functions can i globally initialize variables there?

Originally Posted by GamingMarvel

right so the supprting source codes with the functions in them dont need int main. only the source code that runs the program.

am i understanding right?

Pretty much... "source code" does not run the program, the program simply runs. The source is compiled into individual object files (one for each source file) and then the linker takes all of those and combines them (along with extra code from any needed libraries) into a single executable program that gets run. If there were multiple mains declared in each of the source/object files, then the linker would have a tough job trying to resolve things and spit out an error.

so can you initialize variables in the other source code or do you only get to in the functions you define

Originally Posted by GamingMarvel

so can you initialize variables in the other source code or do you only get to in the functions you define

Global variables are still restricted to File scope and can typically only be accessed by functions within that file. However if you wish to access a global variable from code in another file you can use the extern keyword. ie. extern int x;. That will tell the compiler that you are using a variable declared elsewhere in another file. If the variable isn't initialized in another file you will receive a linker error.

Using the keyword static on a global variable (ie. static int x;) will tell the compiler that the global variable is to maintain file scope disallowing calls from other files using the extern keyword.

ok thanx