program for average two number

Question

program

Answer 1

avoid arithmetic overflow by dividing first then adding.
use x/2 + y/2
instead of (x+y)/2

Answer 2

#include <iostream>

void main()
{
double x, y;
std::cin >> x >> y;
std::cout << (x+y)/2;
}

Answer 3

#include<stdio.h>

int main()
{
double x,y,avj;
scanf("%lf%lf",&x,&y);
avj=(x+y)/2;
printf("%lf",avj);
return 0;
}