题解 | #总成绩和平均分计算#

#include <stdio.h>

int main()
{
    double a = 0;
    double b = 0;
    double c = 0;
    double x = 0;
    double y = 0;
    scanf("%lf %lf %lf", &a, &b, &c);
    x = a + b + c;
    y = x / 3.0;
    printf("%.2lf %.2lf\n", x, y);
    return 0;
}