程序代码：

//输出学生信息要求从大到小
#include<stdio.h>
#define miun 5
int main()
{
    struct stend
    {
        char name[20];
        int strd;
        float v;
    }vs[miun] = { {"李楠",10001,78.4},{"张敏",10002,98.5},{"刘晓丽",10003,89.3},{"美琪",10004,60.2},{"美雪",10005,99} };
    struct stend sm;
    printf("成绩排行\n");
    int s=0, c=0, f=0,ss;
    while (s < miun)
    {
        ss = s;
        for (c=s+1; c < miun; c++)  //c=s+1改成c=c+1;
        {
            if (vs[s].v < vs[c].v)
                ss = c;
            sm = vs[ss];
            vs[ss] = vs[s];
            vs[s] = sm;
        }
        s++;
    }
    while (f < miun)
    {
        printf("名字：%s\t学号:%d\t成绩:%3.2f\n", vs[f].name, vs[f].strd, vs[f].v);
        f++;
    }
}