#include <stdio.h>

/* to add up two integers and return the sum */
int add(int a, int b){

  a += b;
  return a;

}

/* to add up two integers and print the result on the screen */
void add_prt(int a, int b) {

  int c=add(a,b);
  printf("%d + %d = %d\n", a, b, c);

}


int main(){

  int a = 3;
  int b = 5;

  int  c = add(3,5);

  printf("c = add(3,5)\t");
  printf("3 + 5 = %d\n",c);

  c = add(a,b);

  printf("c = add(a,b)\t");
  printf("%d + %d = %d\n", a, b, c);

  c = add(a,b) - 2;

  printf("c = add(a,b)-2\t");
  printf("%d + %d - 2 = %d\n", a, b, c);

  printf("add_prt(3,5)\t");
  add_prt(3,5);

}