#include<stdio.h>
struct student
{
    int ave;
    int num;
    char name[20];
    int score1;
    int score2;
    int score3;
}student[3];


int main()
{
    int i,j;
    struct student temp;
    int ave[3];
    for(i=0;i<3;i++)
    {
        printf("请输入学生%d的资料:\n",i+1);
        printf("学号为:");
            scanf("%d",&student[i].num);
        printf("姓名是:");
            scanf("%s",&student[i].name);
        printf("第一门成绩是：");
        scanf("%d",&student[i].score1);
        printf("第二门成绩是：");
        scanf("%d",&student[i].score2 );
        printf("第三们成绩是：");
        scanf("%d",&student[i].score3 );
        printf("\n");
        student[i].ave =(student[i].score1 +student[i].score2 +student[i].score3 )/3 ;
    }

    printf("学号\t姓名\t语文\t数学\t英语平均分\n");

  
   for(i=0;i<3;i++)
   {
    for(j=0;j<3;i++)
    {
        if(student[j].ave <student[i].ave)
        {
            temp = student[j] ;
            student[j] = student[i];
            student[i] = temp;
        }
    }
   }

for(i=0;i<3;i++)
{
printf("%d\t",student[i].num);
printf("%s\t",student[i].name );
printf("%d\t",student[i].score1 );
printf("%d\t",student[i].score2 );
printf("%d\t",student[i].score3 );
printf("%d\t",student[i].ave );
printf("\n=*=*=*=*=*=*=*=*+*+*+*+*+*+*\n");
}

}

谢谢，知道哪里错了

你不加试试，昨天看你的说了，我改了，后来忘记了，害我弄半天

你那个是结构体中的加的吗？是这样的吗student[i].score2，我也不是很懂啦，呵呵

#include<stdio.h>
#include<stdlib.h>
struct student
{
    int ave;
    int num;
    char name[20];
    int score1;
    int score2;
    int score3;
}s[3];



int cmp(const void *a,const void *b)
{
    struct student *aa=(student *)a;
    struct student *bb=(student *)b;
    if((aa->ave )!= (bb->ave))
        return(((aa->ave) > (bb->ave))? 1:-1);
    else
        return((aa->ave) - (bb->ave));
}


int main()
{
    int i,j;


    for(i=0;i<3;i++)
    {
        printf("请输入学生%d的资料:\n",i+1);
        printf("学号为:");
            scanf("%d",&s[i].num);
        printf("姓名是:");
            scanf("%s",&s[i].name);
        printf("第一门成绩是：");
        scanf("%d",&s[i].score1);
        printf("第二门成绩是：");
        scanf("%d",&s[i].score2 );
        printf("第三们成绩是：");
        scanf("%d",&s[i].score3 );
        printf("\n");
        s[i].ave =(s[i].score1 +s[i].score2 +s[i].score3 )/3 ;
    }

    printf("学号\t姓名\t语文\t数学\t英语\t平均分\n");

    qsort(s,3,sizeof(s[0]),cmp);



  
   

   

for(i=0;i<3;i++)
{
printf("%d\t",s[i].num);
printf("%s\t",s[i].name );
printf("%d\t",s[i].score1 );
printf("%d\t",s[i].score2 );
printf("%d\t",s[i].score3 );
printf("%d\t",s[i].ave );
printf("\n=*=*=*=*=*=*=*=*+*+*+*+*+*+*\n");
}

}



我改好后的，你去掉运行试试，呵呵，行的话，告诉我下，谢谢

恩。多谢指教