//
//	Test 2(b)	#8
//
import java.util.Scanner;

public class Cylinder
{	// instance var.
	private double radius, height;

	// constr
	public Cylinder()
	{
		radius = 0;
		height = 0;
	}
	public Cylinder(double r, double h)
	{
		radius = r;
		height = h;
	}
	public Cylinder(double r)
	{
		radius = r;
	}
	public void set(double r, double h)
	{
		radius = r;
		height = h;
	}
	public double volumn()
	{
		return 3.14 * radius * radius * height;
	}
	public void writeOutput()
	{
		System.out.println("Volumn = " + volumn() );
	}

	public static void main(String[] args)
	{
		Scanner kb = new Scanner(System.in);
		Cylinder one = new Cylinder();

		String answer;
		boolean go = true;
		double ra, he;

		while(go)
		{
			System.out.print("Radius: ");
			ra = kb.nextDouble();
			System.out.print("Height: ");
			he = kb.nextDouble();

			one.set(ra, he);
			one.writeOutput();

			System.out.print("Going on (y/n) ");
			answer = kb.next();
			if(answer.equalsIgnoreCase("n"))
				go = false;
		}
	}
}