How to write your own header file in C language?

Steps to write your own header file in C −

• Enter the code and save it as "sub.h".
• Write a main program named "subtraction.c", which −
  • contains the new header file.
  • Use "sub.h" instead of
  • All functions in the sub.h header file now work.
  • Call function sub() directly.
  • "subtraction.c" and "sub.h" should be in the same folder.

Sub.h

int sub(int m,int n) {
   return(m-n);
}

subtraction.c

Example

#include<stdio.h>
#include "sub.h"
void main() {
   int a= 7, b= 6, res;
   res = sub(a, b);
   printf("Subtraction of two numbers is: %d", res);
}

After running "subtraction.c", the output will output

Subtraction of two numbers is: 1

for −

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