Header files

Hi! I've just created a program (.c) and a header (.h) file with all the functions that I use in my program. Of course I don't have any main() function in the header file, which gives me an error: "Undefined symbol _main in module c0.ASM" if I run the .h file. I've also added a line, telling

Code:

#include "functions.h"

to the .c file and if I run the .c file, everything works without errors. So what is the correct way of creating a project? Should the .h file include a main function (which will result to multiple main() declaration) ?

p.s. I'm using Borland C++ 3.1

Header files are actually not necessary at all, but if you want to use one, go ahead.

Anyway, no, there should not be a main() in the .h file. Each program can have only one main(). A header is not intended to used by itself.

Ok, so I have a functions.h header file (without the main function) and a main.c file. If I add both of them to a project and run it, I get multiple errors saying:

_function1 defined in module MAIN.C is duplicated in module FUNCTIONS.H
_function2 defined in module MAIN.C is duplicated in module FUNCTIONS.H
etc...

although I have defined them ONLY in functions.h file. The same error is produced for the array of records, that I've defined in functions.h. Any idea of what I'm doing wrong?

Here's a small example how it looks in general:

Code:

(functions.h)

int number (int low, int high);

struct rec {
	char name[33];
	};
struct rec arr[5]; // array of records


int number (int low, int high){
... some actions
}

(main.c)

#include "functions.h"

number(1,50)

Originally Posted by nowber

If I add both of them to a project and run it,

I am not familiar with the Borland compiler, so I presume this means you are doing something with the IDE?

Anyway, normatively you just include the .h file in your .c file:

Code:

#include "myheader.h"

Note that is not <myheader.h>. This presumes both files are in the same directory.

Then you just compile the .c file and the .h file will be included.

[edit] okay, it looks like that is what you are already doing....hmmm