/*
 *  =================================================================
 *  Circle(): This class defines circles.
 *  =================================================================
 */

import java.lang.Math.*;

public class Circle {
    double dX, dY, dRadius;

    // Constructor 

    public Circle() {}

    public Circle( double dX, double dY, double dRadius ) {
        this.dX = dX;
        this.dY = dY;
        this.dRadius = dRadius;
    }

    // Compute the circle area ....

    public double Area() {
       return Math.PI*dRadius*dRadius;
    }

    // Copy circle parameters to a string format ...

    public String toString() {
       return "(x,y) = (" + dX + "," + dY + "): Radius = " + dRadius;
    }

    // Exercise methods in class Circle ...

    public static void main( String [] args ) {

       System.out.println("Exercise methods in class Circle");
       System.out.println("================================");

       Circle cA = new Circle( 1.0, 2.0, 3.0 );
       System.out.println("Circle cA : " + cA.toString() );
       System.out.println("Circle cA : Area  = " + cA.Area() );

    }
}