#include<stdio.h>

 void sum();// function declaration
  void main()
  {
    sum(); // function calling  
  }
 void sum()  // function definition
 {
   int a , b, sum=0;
   printf("enter the two numbers:");
   scanf("%d%d", &a,&b);
   sum=a+b;
   printf("sum=%d",sum);
}