C++中'struct' type redefinition有关问题

C++中'struct' type redefinition问题
//main.cpp
#include <iostream>//输入十个学生的学号，名字和成绩并排序
#include "student.h"

using namespace std;

int main()
{
Ourclass student;
student.Input();
student.Sort();
student.Print();
return 0;
}
//student.h
struct Student
{
int Num;//学号
char Name[2];//名字
float Grades;//分数
};
#include "student.h"

class Ourclass
{
private:
Student s[N];//定义N个学生
public:
void Input();
void Print();
void Sort();
};
//student.cpp
#include "student.h"
#include <iostream>

using namespace std;

void Ourclass::Input()
{
cout<<"请输入"<<N<<"个学生的学号、姓名及成绩"<<endl;
int i = 1;
for(;i <= N;i++)
{
cin>>s[i].Num>>s[i].Name>>s[i].Grades;
}
}
void Ourclass::Print()
{
int i = 1;
cout<<"学号 姓名 成绩"<<endl;
for(;i <= N;i++)
{
cout<<s[i].Num<<" "<<s[i].Name<<" "<<s[i].Grades<<endl;
}
}
void Ourclass::Sort()
{
int a,b;
Student temp;
for(a = 0;a != N;a++)
{
for(b = a+1;b != N;b++)
{
if(s[a].Grades <= s[b].Grades)
{
temp = s[a];
s[a] = s[b];
s[b] = temp;
}
}
}
}
这个程序编译时会出错：'Student' :'struct' type redefinition，但是我没重复定义Student类啊。大侠们帮忙看看到底是哪里错了吧！谢谢

[解决办法]
多重包含哈
将student.h文件如下写：

C/C++ code

//student.h#ifndef STUDENT#define STUDENTstruct Student{int Num;     //学号char Name[2];     //名字float Grades;     //分数};class Ourclass{private:Student s[N];     //定义N个学生public:void Input();void Print();void Sort();};#endif