#include<stdio.h>
struct Student
    {
    int num;
    char name[20];
    float score;
    };

int main()
    {
    struct Student stu[5]=
        {
        {10010,"Li",80},
        {10015,"Po",90,
        {10020,"Wu",76},
        {10034,"Qi",79},
        {10056,"Zhang",89}
        };
    struct Student temp;
    const int n=5;
    int i,j;
    printf("the order is:\n");
    for(i=0;i<n-1;i++)
        for(j=i+1;j<n;j++)
            if(stu[j].score>stu[i].score)
                {
                temp=stu[i];
                stu[i]=stu[j];
                stu[j]=temp;
                }
    for(i=0;i<n;i++)
        printf("%6d %8s %6.2f\n",stu[i].num,stu[i].name,stu[i].score);
    return 0;
    }

{10015,"Po",90,
改为
{10015,"Po",90},

参见https://bbs.bccn.net/thread-486259-1-1.html