#include <iostream>
using namespace std;

class Pos
{
private:
    int x, y;

public:
    Pos(int x = 0, int y = 0)
    {
        this->x = x;
        this->y = y;
    }
    int getX() const
    {
        return x;
    }
    int getY() const
    {
        return y;
    }
    void show() const
    {
        cout << '(' << x << ',' << y << ')';
    }
};

class Point : public Pos
{
private:
    int color;

public:
    Point(int x = 0, int y = 0, int color = 0) : Pos(x, y)
    {
        this->color = color;
    }
    int getColor() const
    {
        return color;
    }
    void show() const
    {
        cout << '[';
        Pos::show();
        cout << ':' << color << ']';
    }
};

class Circle : public Point
{
private:
    int radius;

public:
    Circle(int x = 0, int y = 0, int color = 0, int radius = 0) : Point(x, y, color)
    {
        this->radius = radius;
    }
    int getRadius() const
    {
        return radius;
    }
    void show() const
    {
        cout << '{';
        Point::show();
        cout << ',' << radius << '}';
    }
};

class Square : public Circle
{
public:
    Square(int x = 0, int y = 0, int color = 0, int radius = 0) : Circle(x, y, color, radius)
    {

    }
    int getSide() const
    {
        return Circle::getRadius();
    }
    int getRadius() const
    {
        throw "No radius";
        // cout << "No radius!\n";
        // return -1;
    }
};

int main()
{
    Pos pos(3, 6);
    Point t(5, 10, 255*256);
    Circle c(1, 4, 255, 10);
    Square s(5, 5, 0, 30);
    pos.show();
    cout << endl;
    t.show();
    cout << endl;
    c.Pos::show();
    cout << endl;
    s.show();
    cout << endl;
    cout << s.getSide();
    cout << endl;
    try
    {
        cout << s.getRadius();
    } catch(const char *s)
    {
        cout << "Error: " << s;
    }
	return 0;
}