c++ < > == 重载

#include<iostream>using namespace std;//const int TURE = 1;//const int FALSE = 0;class area{private:double l;double h;public:area(double l1=0,double h1=0);bool operator >(area &temp);bool operator <(area &temp);bool operator ==(area &temp);void display();};void area::display(){cout<<l<<" "<<h<<endl;}area::area(double l1,double h1){l=l1;h=h1;}bool area::operator>(area &temp){if((l*h)>(temp.l*temp.h)){return true;}elsereturn false;}bool area::operator<(area &temp){if((l*h)<(temp.l*temp.h)){return true;}elsereturn false;}bool area::operator==(area &temp){if((l*h)==(temp.l*temp.h)){return true;}elsereturn false;}int main(){area a(1,1),b(2,2),c(2,2);cout<<"a<b"<<(a<b)<<endl;cout<<"a>b"<<(a>b)<<endl;cout<<"c==b"<<(c==b)<<endl;cout<<"a==b"<<(a==b)<<endl;return 0;}