c语言编写程序，计算4个整数的和与平均值。题目保证输入与输出均在整型范围内。

#include <stdio.h>

int main() {
    int a, b, c, d;
    scanf("%d%d%d%d", &a, &b, &c, &d);
    int sum = a + b + c + d;
    double average = sum / 4.0;
    printf("sum=%d\n", sum);
    printf("average=%.2lf\n", average);
    return 0;
}