#include<stdio.h>
#include "head.h"
int main(void){
  int a,b;
printf("enter two numbers:");
scanf("%d %d",&a,&b);
printf("add:%d\n",add(a,b));
printf("sub:%d\n",sub(a,b));
printf("mul:%d\n",mul(a,b));
printf("div:%lf\n",div(a,b));
return 0;
}