// 运算符重载的集合应用
// p的定义有错误，暂时无法找到原因

#include "stdafx.h"
#include <iostream>
using namespace std;
class String
{
public:
    String(char *str):p(str){}
    friend bool operator>(String &string1,String &string2);
    friend bool operator<(String &string1,String &string2);
    friend bool operator==(String &string1,String &string2);
    void display();
private:
    char *p;
};

void String::display()
{
    cout<<p;
}

bool operator>(String &string1,String &string2)
{
    if(strcmp(string1.p,string2.p)>0)
        return true;
    else
        return false;
}

bool operator<(String &string1,String &string2)
{
    if(strcmp(string1.p,string2.p)<0)
        return true;
    else
        return false;
}

bool operator==(String &string1,String &string2)
{
    if(strcmp(string1.p,string2.p)==0)
        return true;
    else
        return false;
}

void compare(String &string1,String &string2)
{
    if(operator>(string1,string2)==1)
    {
        string1.display();
        cout<<">";
        string2.display();
    }

    if(operator<(string1,string2)==1)
    {
        string1.display();
        cout<<"<";
        string2.display();
    }

    if(operator==(string1,string2)==1)
    {
        string1.display();
        cout<<"=";
        string2.display'();
    }
}

int main()
{
    String string1("Hello"),string2("Book");
    String string3("Computer"),string4("Hello");
    compare(string1,string2);
    compare(string2,string3);
    compare(string1,string4);
    return 0;
}

编译时有很多错误，怀疑p的定义有错误，请问错在了哪里？

谢谢楼上各位，可我还是想不通错在了哪？