第十二周项目4——（5）

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/**Copyright (c) 2014,烟台大学计算机学院void change(int a[8][8]);*All rights reserved.*文件名称:main.cpp*作者:苏强*完成日期:2015年5月25日*版本号:v1.0**问题描述:建立点类Point和派生圆类circle，判断两个圆的大小关系*/#include <iostream>#include<cmath>using namespace std;static double pi=3.14159;class Point{protected:    double x,y;public:    Point(double X,double Y):x(X),y(Y){}    friend ostream &operator <<(ostream &out,Point &p);};ostream &operator <<(ostream &out,Point &p){    out<<"("<<p.x<<","<<p.y<<")"<<endl;    return out;}class Circle:virtual public Point{protected:    double r;public:    Circle(double X,double Y ,double R):Point(X,Y),r(R){}    friend ostream &operator <<(ostream &out,Circle &c);    double area();    friend  bool operator>(Circle &c1,Circle &c2);    friend  bool operator<(Circle &c1,Circle &c2);    friend  bool operator>=(Circle &c1,Circle &c2);    friend  bool operator<=(Circle &c1,Circle &c2);    friend  bool operator==(Circle &c1,Circle &c2);    friend  bool operator!=(Circle &c1,Circle &c2);};ostream &operator <<(ostream &out,Circle &c){    out<<"圆心：("<<c.x<<","<<c.y<<")   半径："<<c.r<<endl;    return out;}double Circle::area(){    return pi*r*r;}bool operator>(Circle &c1,Circle &c2){    if(c1.r-c2.r>0)        return true;    else            return false ;}bool operator<(Circle &c1,Circle &c2){    if(c1.r-c2.r<0)        return true;    else            return false ;}bool operator>=(Circle &c1,Circle &c2){        if(c1.r-c2.r<0)        return false;    else            return true;}bool operator<=(Circle &c1,Circle &c2){    if(c1.r-c2.r>0)        return false;    else            return true ;}bool operator==(Circle &c1,Circle &c2){    if(c1.r-c2.r==0)        return true;    else            return false ;}bool operator!=(Circle &c1,Circle &c2){    if(c1.r-c2.r!=0)        return true;    else            return false ;}int main(){    Circle c1(3,2,4),c2(4,5,5);    cout<<"圆c1："<<c1<<"面积是："<<c1.area()<<endl;    cout<<"圆c2："<<c2<<"面积是："<<c2.area()<<endl;    cout<<"圆c1";    if(c1>c2)   cout<<" 大于,";    if(c1<c2)   cout<<" 小于,";    if(c1>=c2)  cout<<" 大于等于,";    if(c1<=c2)  cout<<" 小于等于,";    if(c1==c2)  cout<<" 等于,";    if(c1!=c2)  cout<<" 不等于,";    cout<<"圆c2"<<endl;}
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