C++ Average example

#include <stdio.h>
int main(void)
{
        // Read the numbers.
        printf("Enter: ");
        int n1;
        int n2, n3;
        scanf("%d %d %d", &n1, &n2, &n3);

        // Compute the sum and average.
        double sum = n1 + n2 + n3;
        printf("Mean %d %d %d is %f\n", n1, n2, n3, sum/3.0);

        return 0;
}