cout << endl << "输入圆的参数";
cout << endl << "输入圆心点的坐标：" << endl;
center.put();
cout << endl << "输入半径：";
cin >> radius;
}
void print()
{
cout << endl << "圆的参数为";
cout << endl << "圆心点的坐标：" << endl;
center.get();
cout << endl << "半径：" << radius;
}
virtual ~circle(){};
private:
