vim average_3_numbers.c

#include <stdio.h>

int main()
{
        int a, b, c, sum;
        float d;
        printf("Please enter 3 numbers:");
        scanf("%d%d%d", &a, &b, &c);

        sum = a + b + c;
        d = sum / 3;

        printf("Sum is %d\n", sum);
        printf("Average is %f\n", d);
}