/*  Circle.java

    Circle class implementation in Java.
 */

public class Circle
{
    private double radius;

        // Constructors
    public Circle() 
    {
        radius = 1.0;
    }

    public Circle( double r ) 
    {
        radius = r;
    }

    public void setRadius( double r ) 
    {
        radius = r;
    }

    public void showRadius() 
    {
        System.out.println( radius );
    }


    public static void main( String [] args )
    {
        Circle c1 = new Circle();
        Circle c2 = new Circle( 5.31 );

        System.out.print( "Radius of c1: " );
        c1.showRadius();
        System.out.print( "Radius of c2: " );
        c2.showRadius();

        c1.setRadius( 2.1 );
        System.out.print( "Radius of c1: " );
        c1.showRadius();
    }
}