题解

#include<stdio.h>

typedef struct info{
    int id,chn,mth,eng,total;
    double avg;
}stu;

int main(void){
    int n;
    scanf("%d",&n);
    stu arr[110];
    for (int i=0;i<n;i++){
        scanf("%d%d%d%d",&arr[i].id,&arr[i].chn,&arr[i].mth,&arr[i].eng);
        arr[i].total=arr[i].chn+arr[i].eng+arr[i].mth;
        arr[i].avg=arr[i].total/3.0;
    }
    for (int i=0;i<n;i++){
        printf("%d %d %d %d %d %.2f\n",arr[i].id,arr[i].chn,arr[i].mth,arr[i].eng,arr[i].total,arr[i].avg);
    }
    return 0;
}