#include<iostream>
#include<string>
using namespace std;
//圆的类
class yuan{
public:
	int x2 = 10;
	int y2 = 10;
	int r = 5;
};
//点的类
class dian{
public :
	void setx(int x){
		x1 = x;
	}
	int getx(){
		return x1;
	}
	void sety(int y){
		y1 = y;
	}
	int gety(){
		return y1;
	}
private:
	int x1;
	int y1;
};
//判断方法
void pandian(dian p,yuan s){
	int t = (((p.getx() - s.x2)*(p.getx() - s.x2)) - ((p.gety() - s.y2)*(p.gety() - s.y2)));
	if (t> s.r) cout << "在圆外" << endl;
	else if (t== s.r) cout << "在圆上" << endl;
	else cout << "在圆内" << endl;
}
int main(){
	dian p;
	yuan s;
	p.setx(100);
	p.sety(20);
	pandian(p, s);
	system("pause");
	return 0;
}