Thread: including files

I would like to use a method written in another c file that I have.

How would I do this?

Make sure you link the two files together and you can just declare the function:

Code:

// file1.c
void function( void ) {
  // stuff
}

Code:

// file2.c
void function( void );


int main( void ) {
  function();
}

Code:

C:\> gcc file1.c file2.c

It's probably better to add a header file to do that for you though. Then you can add more stuff any not have to keep typing a declaration every time you want to use it:

Code:

// file1.h
#ifndef _FILE1_H_
#define _FILE1_H_


void function( void );


#endif

Code:

// file1.c
#include "file1.h"


void function( void ) {
  // stuff
}

Code:

// file2.c
#include "file1.h"


int main( void ) {
  function();
}

Code:

C:\> gcc file1.c file2.c