#include<stdio.h>
int main()
{
    int i;
    double average,sum=0;
    int a[4];
    
    printf("请输入四个数：");
    for(i=0;i<4;i++){
        scanf("%d",&a[i]);
        sum=sum+a[i];
    }
    average=sum/4;
    printf("average=%.1f\n",average);
    printf("sum=%.1f\n",sum);
    
    return 0;
}