--------------------Configuration: StudentsVsCPlusPlus - Win32 Debug--------------------
Compiling...
StudentsVsCPlusPlus.cpp
C:\Documents and Settings\Administrator\桌面\StudentsVsCPlusPlus\StudentsVsCPlusPlus.cpp(65) : error C2593: 'operator >>' is ambiguous
C:\Documents and Settings\Administrator\桌面\StudentsVsCPlusPlus\StudentsVsCPlusPlus.cpp(66) : error C2593: 'operator <<' is ambiguous
C:\Documents and Settings\Administrator\桌面\StudentsVsCPlusPlus\StudentsVsCPlusPlus.cpp(73) : error C2593: 'operator >>' is ambiguous
C:\Documents and Settings\Administrator\桌面\StudentsVsCPlusPlus\StudentsVsCPlusPlus.cpp(76) : error C2593: 'operator <<' is ambiguous
C:\Documents and Settings\Administrator\桌面\StudentsVsCPlusPlus\StudentsVsCPlusPlus.cpp(77) : error C2593: 'operator >>' is ambiguous
Error executing cl.exe.

StudentsVsCPlusPlus.obj - 5 error(s), 0 warning(s)



这五个错误时怎么回事 啊，在vc6里面出现的错误 ，在vs2010中无误，这个错误怎么改呢，下面是相关的一些代码，
#include "stdafx.h"
#include <iostream>

#include "Student.h"
#include"Friend.h"
#include"Teacher.h"


#include <fstream>
#include <string>

#include <iomanip>
#include <cstdlib>



ostream & operator<<(ostream &out,Student &s)
{
    out<<s.name<<""<<s.num<<""<<s.nAge<<""
        <<s.addr<<'\n';
    return out;
}
istream & operator>>(istream &in,Student &s)
{
    in>>s.name>>s.num>>s.nAge>>s.addr;
    return in;

}

extern _CRTIMP istream MyMethod()
{
    return     cin;
}


int main(int argc, char* argv[])
{

ofstream ofile;
    ifstream ifile;
    ofile.open("d:s.txt");

    Student s;
    for (int i=1;i<=3;i++)
    {
        cout<<"请输入第"<<i<<"个学生的姓名 学号 年龄  住址"<<endl;
        MyMethod()>>s;             //调用>>运算符重载函数，输入学生信息
        ofile<<s;                        //调用<<运算符重载函数，将学生信息写入到文件中
    }

    ofile.close();

    cout<<"\n读出文件内容"<<endl;
    ifile.open("d:\\s.txt");
    ifile>>s;
    while(!ifile.eof())
    {
        cout<<s;
        ifile>>s;
    }
    ifile.close();

}


student类中相关代码

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include <string>
#include <iostream>
#include"Person.h"
using namespace std;




class Student  : public Person
{
public:
    char name[10];
    int num;
    char addr[15];
    friend ostream & operator<<(ostream &out,Student &s);
    friend istream & operator>>(istream &in,Student &s);

    string strNO;
    string strName;
    int        nAge;
    string strGender;
    string strInterest;
    int        nStudyWill;//0~100表示学习意愿

private:
    int nHeight;
    int nWeight;
public:
    string GetTask();


     friend void Display(Student &stu)
    {
        cout << "开始输出个人的公开信息：" << endl;
        stu.PrintInfo();

        cout << "开始输出个人隐私信息："<<endl;
        cout << "身高:" << stu.nHeight << endl;
        cout << "体重:" << stu.nWeight << endl;
    }
    void SetPersonalInfo(int iHeight,int iWeight);
    void PrintInfo();
    Student();
    Student(string sNO,string sName,int iAge,string sGender,
        string sInterest,int iStudyWill);
   
    virtual ~Student();
    friend class Friend;
   
};



与错误相关的代码就是这些了  ，大神些帮帮我吧，在vc6中怎么改  ？vs2010中可以正常编译。谢谢

MyMethod()>>s;             //调用>>运算符重载函数，输入学生信息
拜托了

谢谢