输入输出——求平均值

#include<stdio.h>
int main()
{
    int a,b,c,d,sum;
    double average;
    scanf("%d %d %d %d",&a,&b,&c,&d);
    sum=a+b+c+d;
    average=sum*1.0/4;
    printf("Sum = %d; Average = %.1lf",sum,average);//%m.nlf n为小数点后的位数
    return 0;
}