重载运算符学习

<pre name="code" class="cpp">/***************************************/重载运算符的学习2015年8月/**************************************/#include <iostream>using namespace std;class ApRect{public://ApRect(){}ApRect(double ht,double wid){height=ht;width=wid;}//double Area(){return height*width;}double Width(){return width;}double Height(){return height;}//friend istream& operator >>(istream& in,ApRect& cls);//friend ostream& operator <<(ostream& out,ApRect& cls);//double operator + (const ApRect rect);//double operator [] (const int index);//friend bool operator > (ApRect rect_1, ApRect rect_2_);bool operator < (ApRect rect);//~ApRect(){}private:double height;double width;};istream& operator >> (istream& in, ApRect& cls){cout<<"input height and width:";in>>cls.height>>cls.width;return in;}ostream& operator <<(ostream& out, ApRect& cls){out<<"height:"<<cls.height<<";width:"<<cls.width;return out;}double ApRect::operator +(ApRect rect){return Area()-rect.Area();}double ApRect::operator [](int a){switch(a){case 0:return Height();break;case 1:return Width();break;case 2:return Area();break;default:return 0.0;break;}}bool operator >(ApRect rect_1,ApRect rect_2){return (rect_1.Area()>rect_2.Area()) ? true:false;}bool ApRect::operator <(ApRect rect){return (Area()<rect.Area()) ? true:false;}int main(){ApRect rect_1;ApRect rect_2(10,20);cin>>rect_1;cout<<endl<<"rect_1"<<rect_1<<endl;cout<<"rect_2:"<<rect_2<<endl<<endl;

//addcout<<"+:"<<rect_1+rect_2<<endl;return 0;}