#include<stdio.h>
struct student
{
    char name[10];
    int grade[3],average;
    long int xuehao;
}stu[5];
int main()
{
    int i,j,s,sum=0,max,m,t=0,c,e,a,b,h,f,av;
    int d[5];
    int math[5],chinese[5],english[5],average[5];
    struct student stu[5];
    for(i=0;i<5;i++)
    {
        printf("enter xuehao:");
        scanf("%d",&stu[i].xuehao);
        printf("enter name:");
        scanf("%s",stu[i].name);
        
        printf("enter the grades[3]:\n");
        for(j=0,s=0;j<3;j++)
        {
            scanf("%d",&stu[i].grade[j]);
            s=s+stu[i].grade[j];
        }
        average[i]=s/3;
        stu[i].average=average[i];
    }
    for(i=0;i<5;i++)
    {
        math[i]=stu[i].grade[0];
        chinese[i]=stu[i].grade[1];
        english[i]=stu[i].grade[2];
    }
    m=0;
    c=0;
    e=0;
    for(i=0;i<5;i++)
    {
        if(m<math[i])
        {
        m=math[i];a=i;
        }
        
        if(c<chinese[i])
        {
        b=i;c=chinese[i];
        }
        
        if(e<english[i])
        {
            h=i;e=english[i];
        }
   
    }
    printf("math最高的学生:%ld %s %d\n",stu[a].xuehao,stu[a].name,stu[a].grade[0]);
    printf("chinese最高的学生:%ld %s %d\n",stu[b].xuehao,stu[b].name,stu[b].grade[1]);
    printf("english最高的学生:%ld %s %d\n",stu[h].xuehao,stu[h].name,stu[h].grade[2]);
   
av=average[1];            max=0;
    for(i=0;i<5;i++)
    {
        if(av<average[i])
        {f=i;av=average[i];}
   
    }
    printf("平均分最高的学生：%ld %s %d\n",stu[f].xuehao,stu[f].name,av);


        for(j=0,i=0;j<5,i<5;j++,i++)
        {
            if(av<average[j])
            { d[i]=j;av=average[j];}

        }


printf("number\tname\tmath\tchinese\tenglish\taverage\n");/*只运行到这个地方就不再运行且提示关闭程序*/
for(i=0;i<5;i++)
printf("%ld\t%s\t%d\t%d\t%d\t%d\n",stu[d[i]].xuehao,stu[d[i]].name,stu[d[i]].grade[0],stu[d[i]].grade[1],stu[d[i]].grade[2],stu[d[i]].average);

return 0;
}

初始化了还是不对，不知道怎么让d[i]被赋值得到average[]的从大到小的顺序。能帮我改改吗

调试木有错的哦

运行出来了！