/*
 * Authored by: Zille Huma Kamal and Ajay Gupta
 */

using System;

class Point
{
    private int x, y;

    public Point()
    {
    }

    public Point(int xvalue, int yvalue)
    {
        X = xvalue;
        Y = yvalue;
    }
    public int X
    {
        get { return x; }
        set { x = value; }
    }
    public int Y
    {
        get { return y; }
        set { y = value; }
    }
    public override string ToString()
    {
        return base.ToString() + " at [" + X + ", " + Y + "]";
    }

}//end of class Point

class Circle : Point
{
    private double radius;

    public Circle()
    {
    }
    public Circle(int xvalue, int yvalue, double radiusvalue)
        : base(xvalue, yvalue)
    {
        Radius = radiusvalue;
    }
    public double Radius
    {
        get { return radius; }
        set { if (value >= 0)radius = value; }
    }
    public double Diameter()
    {
        return Radius * 2;
    }
    public double Circumference()
    {
        return Math.PI * Diameter();
    }
    public virtual double Area()
    {
        return Math.PI * Math.Pow(Radius, 2);
    }
    public override string ToString()
    {
        return base.ToString() + " with Radius = " + Radius;
    }
     

}//end of class Circle


class Test
{
    public static void Main()
    {
        Point p1 = new Point(30, 50);
        Circle c1 = new Circle(120, 89, 2.7);
        Circle c2 = new Circle(5, 6, 2.0);

        Console.WriteLine("p1 is " + p1);
        Console.WriteLine("c1 is " + c1);
        Console.WriteLine("c2 is " + c2);

        c2 = c1;
        Console.WriteLine("c2 now is " + c2);



        

    }
}//end of class Test