using System;

public class Program

{

    public static void Main()

    {

        Circle c1 = new Circle();

        Console.WriteLine("The circle has a radius of " + c1.getRadius() + " and the area of " + c1.getArea());

        Circle c2 = new Circle (2.0);

        Console.WriteLine("The circle has a radius of " + c2.getRadius() + " and area of " + c2.getArea());

        Circle c3 = new Circle (3.0, "green");

        Console.WriteLine("The circle has the radius of " + c3.getRadius() + " and area of " + c3.getArea()+ " and is the colour " + c3.getColour());

        Circle c4 = new Circle();

        c4.setRadius(5.5);

        Console.WriteLine("radius is: " + c4.getRadius());

        c4.setColour("green");

        Console.WriteLine("colour is: " + c4.getColour());

        Circle c5 = new Circle(5.5);

        Console.WriteLine(c5.toString());

    }

}

​

class Circle{

    private double radius;

    private string colour;

    //CIRCLES

    public Circle(){

        radius = 1.0;

        colour = "red";

    }

    public Circle(double r){

        this.radius = r;

        colour = "red";

    }

    public Circle (double r, string c) {

        radius = r;

        colour = c;

    }

    //GETTERS

    public double getRadius(){

        return radius;

    }

    public double getArea() {

        return radius*radius*Math.PI;

    }

    public string getColour(){

        return colour;

    }

    //!!!!!!

    public void setRadius (double newRadius) {

        radius = newRadius;

    }

    public void setColour(String colour){

        this.colour = colour;

    }

    public string toString() {

        return "Circle[radius=" + radius + "colour=" + colour + "]";

    }

}