c++双目运算符重载，双目运算符重载为普通函数时

/************************************************双目运算符是C++中最常用的运算符，有两个操作数。*************************************************/#include <iostream>#include <string.h>using namespace std;class String{public: String(){p = NULL;} String (char *str);///String (char str[]) friend bool operator>(String&string1,String &string2); void display();private: char*p;};String::String(char *str){ p=str;}void String::display(){ cout<<p;}bool operator>(String &string1,String &string2) ///bool类型{ if(strcmp(string1.p,string2.p)>0) return true; else return false;}int main(){String string1("hello"),string2("Beijing");cout<<(string1>string2)<<endl; return 0;} 86176171