#include <stdio.h>

void dowork(int a,int b,int *sum, int *prod , int *avg);

int main() {
    int a =3, b =5;
    int sum ,prod ,avg;
    dowork(a ,b ,&sum ,&prod ,&avg);
    
    printf("sum = %d, prod = %d, avg = %d\n",sum ,prod ,avg);

return 0;
}

void dowork(int a, int b, int *sum, int *prod, int *avg){
    *sum= a + b;
    *prod = a* b;
    *avg = (a+b)/2;
}