Header File Using GCC

CREATE HEADER FILE IN C  USING GCC

Steps Are as Follows :

Step 1:-

Create a headeR file  with .H extension  .As you know Header Files Only Contain the Function Declarations:-

We will be creating swap.h with contents as-

extern void swap (int* a, int* b);

Step 2:-

Create Another File Named "swap.c"  .We Will Be Writing The Function Body In this File -

void swap (int* a, int* b)
{
    int temp;
    temp = *a;
    *a = *b;
    *b = temp;
}

Step3:-

Now we will be writing our Main program .So Create A C file Named AS " Main.c" . We will be writing Here The Actual Code Implementation And Using Our Hand Made Header File.

#include "swap.h"
#include <stdio.h>

int main()
{
int a=1;
int b=2;
swap (&a,&b);
printf ("a=%d\n", a);
printf ("b=%d\n",b);
return 0;
}

Step 4:-

Now We will be Compiling our whole source code

go to Terminal 

# gcc -c  Main.c  swap.c .  

Output will be Main.o and swap.o

#gcc -o  Main  Main.o swap.o

Output Will Be Main.exe or Main.o in windows or Ubuntu 

Open  command  Prompt or Terminal -Type  Main.exe in windows or Main in ubuntu  to see the Actual output