一道C语言题目，帮忙解答~谢谢

#include <stdio.h>

#define n 10

struct score
{
int num;
float math; //数学成绩
float english; //英语成绩
float computer; //计算机成绩
float avg; //平均成绩
float all; //总成绩
};

void fun(struct score s[])
{
int i,j,t1;
float t;
for(i=0;i<n;i++)
for(j=i+1;j<n;j++)
if(s[i].all<s[j].all)
{
t=s[i].all;
s[i].all=s[j].all;
s[j].all=t;

t=s[i].avg;
s[i].avg=s[j].avg;
s[j].avg=t;

t=s[i].computer;
s[i].computer=s[j].computer;
s[j].computer=t;

t=s[i].english;
s[i].english=s[j].english;
s[j].english=t;

t=s[i].math;
s[i].math=s[j].math;
s[j].math=t;

t1=s[i].num;
s[i].num=s[j].num;
s[j].num=t1;

}
for(i=0;i<n;i++)
printf("编号:%d,学号:%d,数学成绩:%f,英语成绩:%f,计算机成绩:%f,平均分:%f,总分:%f\n",i+1,s[i].num,s[i].math,s[i].english,s[i].computer,s[i].avg,s[i].all);
}

void main()
{
int i;
struct score s[n];
printf("请输入学生信息:\n");
for(i=0;i<n;i++)
{
printf("学生 %d的信息\n学号: ",i+1);
scanf("%d",&s[i].num);
printf("数学成绩: ");
scanf("%f",&s[i].math);
printf("英语成绩: ");
scanf("%f",&s[i].english);
printf("计算机成绩: ");
scanf("%f",&s[i].computer);
s[i].avg=(s[i].computer+s[i].english+s[i].math)/3;
s[i].all=s[i].computer+s[i].english+s[i].math;

}
fun(s);
}

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