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定义函数处理结构体数组，按成绩从高到低降序排列。
函数接口定义：
struct stu { int num; char name[20]; int score; }; void fun ( struct stu *p,
int n );
p是结构体数组的起始地址，n是结构体单元个数。
结构体成员：num是学号，name是姓名，score是成绩。
裁判测试程序样例：
在这里给出函数被调用进行测试的例子。例如： #include <stdio.h> struct stu{ int num; char name[20];
int score; }; void fun( struct stu *p, int n ); int main() { struct stu a[20];
int n, i; scanf("%d", &n); for(i = 0; i < n; i++){ scanf("%d%s%d", &a[i].num,
a[i].name, &a[i].score); } fun(a,n); for(i = 0; i < n; i++) printf("%d %s
%d\n", a[i].num, a[i].name, a[i].score); return 0; } /* 请在这里填写答案 */
输入样例：
在这里给出一组输入。例如：
6 1001 anny 85 1002 boy 75 1003 car 65 1004 dan 55 1005 emm 95 1006 pa 35
输出样例：
在这里给出相应的输出。例如：
1005 emm 95 1001 anny 85 1002 boy 75 1003 car 65 1004 dan 55 1006 pa 35 void
fun ( struct stu *p, int n ){ int i; int j; for(i=0;i<n;i++){
for(j=0;j<n-i;j++){ if(p[j+1].score>p[j].score){ struct stu temp; temp=p[j];
p[j]=p[j+1]; p[j+1]=temp; } } } }
