c++菜鸟求助TAT

#include <iostream>
#include <cstdio>
#include <string.h>
using namespace std;
const int Max=30;
int N=5;
class Student;
void setData(Student &S);
void count(Student &S);
void sort(Student s[],int N);
double getAverage(Student s[],int N);
void print(Student &S);
int search(Student s[],int N,char *n);
class Student
{
public:
char number[Max];
char name[Max];
double chinese;
double math;
double english;
double total;
double average;
int rank;
}s;
//成绩录入
void setData(Student &S)
{
cout<<"输入学号，姓名，语文，数学，英语成绩："<<endl;
cin>>s.number>>s.name>>s.chinese>>s.math>>s.english;
s.total=0;
s.average=0;
s.rank=0;
}
//成绩统计，求平均分
void count(Student &S)
{
s.total=s.chinese+s.math+s.english;
s.average=s.total/3;
}
double getAverage(Student s[])
{
double Average=0;
for(int i=0;i<N;i++)
Average+=(s[i].chinese+s[i].math+s[i].english);
Average/=(N*3);
return Average;
}
//成绩排名
void sort(Student s[],int N)
{
int index;
Student inserter;
for(int i=1;i<N;i++)
{
inserter=s[i];
index=i-1;
while(index>=0&&inserter.average>s[index].average)
{
s[index+1]=s[index];
index--;
}
s[index+1]=inserter;
}
for (int j=0;j<N;j++)
s[j].rank=j+1;
}
//成绩查询
int search(Student s[],int N,char *n)
{
for(int i=0;i<N;i++)
{
if(strcmp(s[i].number,n)==0)
return i;
}
return -1;
}
//输出
void print(Student &S)
{
cout<<"排名"<<"\t"<<"学号"<<"\t"<<"姓名"<<"\t"<<"语文"<<"\t"<<"数学"<<"\t"<<"英语"<<"\t"<<"总分"<<"\t"<<"平均分"<<endl;
cout<<s.rank<<"\t"<<s.number<<"\t"<<s.name<<"\t"<<s.chinese<<"\t"<<s.math<<"\t"<<s.english<<"\t"<<s.total<<"\t"<<s.average<<endl;
}
//主函数
int main()
{
Student s[N];
for(int i=0;i<N;i++)
{cout<<"下面输入第"<<i+1<<"位同学的数据："<<endl;
setData(s[i]);
cout<<endl;
}
sort(s,N);
int order=1;
while(order!=6)
{
cout<<"******************************命令菜单**********************************"<<endl;
cout<<"1.打印所有排名"<<endl;
cout<<"2.打印出成绩在班级平均分以上的学生信息"<<endl;
cout<<"3.输入学号，查询该学生考试信息"<<endl;
cout<<"4.退出系统"<<endl;
cout<<"************************************************************************"<<endl;
cout<<"输入命令选择：";
cin>>order;
switch (order)
{
case 1:
{
for(int j=0;j<N;j++)
print (s[j]);
}break;
case 2:
{
double compare=getAverage(s);
for(int k=0;k<N;k++)
if(s[k].average>compare)
print(s[k]);
}break;
case 3:
{
char code[Max];
cout<<"输入需要查询的学号：";
cin>>code;
int result=search(s,N,code);
if(result==-1)
cout<<"您输入的学号不存在！"<<endl;
else print(s[result]);
}break;
case 4:
break;
default:
cout<<"输入命令错误！"<<endl;
}
}
return 0;
}