希望大家帮我看看这个程序、看他错在哪儿了。谢谢，，

# include <iostream>
using namespace std;
struct xs
{
int 学号;
char 姓名[5];
char 性别;
int 成绩[3];
int 总成绩;
};
const int n=3;

int main()
{
    void input(struct xs *s,int n);
    void output(struct xs *s,int n);
    void px(struct xs *s);
    struct xs xsb[3];
    //cout<<"姓名"<<"     "<<"学号"<<"    "<<"性别"<<"    "<<"成绩1"<<"    "<<"成绩2"<<"    "<<"成绩3"<<"    "<<"总成绩"<<endl;
    input(xsb,3);
    cout<<"姓名"<<'\t'<<"学号"<<'\t'<<"性别"<<'\t'<<"成绩1"<<'\t'<<"成绩2"<<'\t'<<"成绩3"<<'\t'<<"总成绩"<<endl;
     px(xsb);
    output(xsb,3);
   
system("pause");
return 0;
}


void input(struct xs *s,int n)
{

for(int i=0;i<n;i++)
{
    cout<<"姓名:";
   cin>>s->姓名;
   cout<<"学号:";
   cin>>s->学号;
   cout<<"性别:";
   cin>>s->性别;
   cout<<"成绩1;";
   cin>>s->成绩[0];
   cout<<"成绩2;";
   cin>>s->成绩[1];
   cout<<"成绩3;";
   cin>>s->成绩[2];
   for(int m=0;m<3;m++)
   {
   s->总成绩=s->成绩[0]+s->成绩[1]+s->成绩[2];
   }
}
}

void px(struct xs *s)
{
for(int y=0;y<n;y++)
    {
    struct xs t;
    struct xs *s;
    int r,c;
    for(r=0;r<n;r++)
    {
    for(c=0;c<n-1-r;c++)
    if(s->总成绩>(s+1)->总成绩)
    {
    t=s[c];
    s[c]=s[c+1];
    s[c+1]=t;
    }
        s++;
    }
    }

}void output(struct xs *s,int n)
{        
for(int i=0;i<n;i++)
{
cout<<s->姓名<<'\t'<<s->学号<<'\t'<<s->性别<<'\t'<<s->成绩[0]<<'\t'<<s->成绩[1]<<'\t'<<s->成绩[2]<<'\t'<<s->总成绩<<endl;
s++;
}
}