13周 项目2 圆的比较

#include 
  
   
#include 
   
     using namespace std; class Point { public: Point(double a,double b):x(a),y(b) {} double getx() { return x; } double gety() { return y; } friend ostream&operator << (ostream&,Point&); protected: double x,y; }; ostream&operator << (ostream &output,Point &p) { output<<"("<
    
      (Circle &c); bool operator < (Circle &c); bool operator >= (Circle &c); bool operator <= (Circle &c); bool operator == (Circle &c); bool operator != (Circle &c); protected: double r; }; ostream&operator << (ostream &output,Circle &c) { output<<"("<
     






       (Circle &c) { if(r>c.r) return true; else return false; } bool Circle::operator >= (Circle &c) { if(*this
      
       c)return false; return true; } bool Circle::operator == (Circle &c) { if(*this>=c&&*this<=c)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); cout<<"c1:"<
       
         c2) cout << "c1>c2" << endl; if (c1 < c2) cout << "c1
        
         = c2) cout << "c1≥c2" << endl; if (c1 <= c2) cout << "c1≤c2" << endl; return 0; }