C++类嵌套类练习

#include<iostream>
#include<string>
using  namespace  std;

class  point{
private:
        int  x;
        int  y;
public:
        void  setx(int  x){
              this->x=x;
      }
      int  getx(){
              return  x;
      }
      void  sety(int  y){
              this->y=y;
      }
      int  gety(){
              return  y;
      }
};
class  circle{
private:
        int  r;
        point  center;
public:
        void  setr(int  r){
                this->r=r;
        }
        int  getr(){
                return  r;
        }
        void  setc(point  center){
                this->center=center;
        }
        point  getc(){
                return  center;
        }

        void  judge(point  &p){
                if(((center.getx()-p.getx())*(center.getx()-p.getx()))+((center.gety()-p.gety())*(center.gety()-p.gety()))==r*r){
                        cout<<"在圆上"<<endl;
                }
                else  if(((center.getx()-p.getx())*(center.getx()-p.getx()))+((center.gety()-p.gety())*(center.gety()-p.gety()))>r*r){
                        cout<<"在圆外"<<endl;
                }
                else{
                        cout<<"在圆内"<<endl;
                }              
        }
};
int  main(){   
        point  p1;
        p1.setx(0);
        p1.sety(0);
        circle  c;
        c.setc(p1);
        c.setr(1);
        point  p;
        p.setx(0);
        p.sety(1);    
        c.judge(p);  
        return  0;
}