圆的比较

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/*烟台大学计算机学院学生*All right reserved.*文件名称：圆的比较*作者：杨飞*完成日期：2014年4月20日*版本号：v1.0*对任务及求解方法的描述部分:圆的比较*我的程序：*/#include <iostream>#include <cmath>using namespace std;class point{protected:    double x,y;public:    point(double xx,double yy):x(xx),y(yy){}    double getx()    {        return x;    }     double gety()    {        return y;    }    ~point()    {    }    friend ostream& operator <<(istream &putout,point &c);};ostream& operator <<(ostream &putout,point &c){    putout<<"("<<c.getx()<<","<<c.gety()<<")"<<endl;    return putout;}class circle:public point{private:    double r;public:    circle(double xx,double yy,double rr):        point(xx,yy),r(rr){}    ~circle()    {    }    friend ostream& operator <<(ostream &putout,circle &c);    double area()    {        return 3.14*r*r;    }    bool operator >=(circle c);    bool operator <(circle c);    bool operator <=(circle c);    bool operator >(circle c);    bool operator ==(circle c);    bool operator !=(circle c);};ostream& operator <<(ostream &putout,circle &c){    putout<<"("<<c.getx()<<","<<c.gety()<<")"<<endl;    putout<<"半径"<<c.r<<endl;     return putout;}bool circle::operator >=(circle c){    if(area()>=c.area())    return true;    return false;}bool circle::operator <(circle c){    if(*this>=c)        return false;    return true;}bool circle::operator <=(circle c){    if(area()<=c.area())    return true;    return false;}bool circle::operator >(circle c){    if(*this<=c)        return false;    return true;}bool circle::operator ==(circle c){    if(area()==c.area())        return true;    return false;}bool circle::operator !=(circle c){    if(*this==c)        return false;    return true;}int main( ){    circle c1(3,2,4),c2(4,5,5);      //c2应该大于c1     cout<<"圆c1: "<<c1;    cout<<"圆c2: "<<c2;     cout << "下面比较两个圆的大小：\n";    if (c1 > c2) cout << "c1>c2" << endl;    if (c1 < c2) cout << "c1<c2" << endl;    if (c1 == c2) cout << "c1＝c2" << endl;    if (c1 != c2) cout << "c1≠c2" << endl;    if (c1>= c2) cout << "c1≥c2" << endl;    if (c1 <= c2) cout << "c1≤c2" << endl;    return 0;}
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心得体会;wu!
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