#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;
}