求高手，帮忙修改一下，为什么在VC中运行总显示错误呀 - C++教室 - C++论坛

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求高手，帮忙修改一下，为什么在VC中运行总显示错误呀

#include<iostream>
using namespace std;
class String
{
public:
    String()
    {p=NULL;}
    String(char *str);
    friend bool operator>(String &string1,String &string2);
    friend bool operator<(String &string1,String &string2);
    friend bool operator==(String &string1,String &string2);
    void display();
    char *p;
};
String::String(char *str)
{p=str;}
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();}
    else
    if(operator<(string1,string2)==1)
    {string1.display();cout<<"<";string2.display();}
    else
    if(operator==(string1,string2)==1)
    {string1.display();cout<<"=";string2.display();}

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

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#include<iostream> using namespace std; class String { public: String() {p=NULL;} String(char *str); friend bool operator>(String &string1,String &string2); friend bool operator<(String &string1,String &string2); friend bool operator==(String &string1,String &string2); void display(); char *p; }; String::String(char *str) {p=str;} 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();} else if(operator<(string1,string2)==1) {string1.display();cout<<"<";string2.display();} else if(operator==(string1,string2)==1) {string1.display();cout<<"=";string2.display();} } //大哥，少了一个括号。。还有，你不会看错误原因吗？ int main() { String string1("Hello"),string2("Book"),string3("Computer"),string4("Hello"); compare(string1,string2); compare(string2,string3); compare(string1,string4); return 0; }