Function Passing Arguments and Returning Value

This program describes that function passing arguments and returning value.

#include <stdio.h>
#include <conio.h>

int sum (int, int);

void main()
{
  int a,b,c;
  printf("enter two numbers :");
  scanf("%d%d",&a,&b);
  c = sum(a,b);
  printf("n the sum of two numbers is : %d", c);
  getch();
}
int sum(int s, int t){
  int add;
  add = s+t;
  return (add);
 }

Output