第十二周项目4——点与圆的关系{（判断两个圆面积的大小）

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（5）在圆类上重载关系运算符（6种），使之能够按圆的面积比较两个圆的大小。自编main函数完成测试。

代码如下：

#include <iostream>using namespace std;class Point{protected:    double x,y;public:    Point(int xx=0,int yy=0):x(xx),y(yy) {}    friend ostream& operator<<(ostream&output,const Point &c);};ostream& operator<<(ostream&output,const Point &c){    output<<"("<<c.x<<","<<c.y<<")"<<endl;    return output;}class Circle:public Point{protected:    double radius;public:    Circle(int xx=0,int yy=0,double rr=0):Point(xx,yy),radius(rr){};    friend ostream& operator<<(ostream&output,const Circle &c);    bool operator > (Circle &c);    bool operator < (Circle &c);    bool operator >= (Circle &c);    bool operator <= (Circle &c);    bool operator == (Circle &c);    bool operator != (Circle &c);    double area(Circle &);};ostream& operator<<(ostream&output,const Circle &c){    output<<"("<<c.x<<","<<c.y<<","<<c.radius<<")"<<endl;    return output;}double Circle::area(Circle &c){    return 3.14159*c.radius*c.radius;}bool Circle::operator>(Circle &c){    if(area(*this)>area(c))        return true;    else        return false;}bool Circle::operator<(Circle &c){    if(area(*this)<area(c))        return true;    else        return false;}bool Circle::operator >= (Circle &c){    if (area(*this)>=area(c))        return true;    else        return false;}bool Circle::operator <= (Circle &c){    if (area(*this)<=area(c))        return true;    else        return false;}bool Circle::operator == (Circle &c){    if (area(*this)==area(c))        return true;    else        return false;}bool Circle::operator != (Circle &c){    if (area(*this)==area(c))        return false;    else        return true;}int main( ){    Circle c1(3,2,4),c2(4,5,5);      //c2应该大于c1    cout<<"圆c1: "<<c1<<"的面积="<<c1.area(c1)<<endl;    cout<<"圆c2: "<<c2<<"的面积="<<c2.area(c2)<<endl;    cout<<"下面比较两个圆面积的大小："<<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;    if (c1!=c2) cout<<"c1≠c2"<<endl;    return 0;}

总结：感觉自己在编程序就是不太认真，

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