Thread: how difference between including the header file and source file in main file

Hi,

i have two files. 1.c and 2.h like below


2.h file

Code:

int fun()
{
        printf ("hai how are you\n");
        return 0;
}

1.c file

Code:

#include<stdio.h>
#include"2.h"
int i;
int j;
int main()
{
        int fun();
        printf ("%d\n",i);
        fun();
        printf ("%d\n",i);
}

if run the above program by using #cc 1.c , i should get the output as

"0
hai how are you
0".

if i rename the 2.h to 2.c and reflect the same change in include file on 1.c , then also i get the same output.


actualy what is the correct procedure?

in which condition i include .h file and in which condition i need to include .c file?

i would appreciate any help.