import awb.*;
import java.awt.*;
import java.awt.event.*;

public class CylinderVolume extends java.applet.Applet 
		implements ActionListener
{
    double r, h, V;
    DoubleField rF, hF, VF;
    Button b1;
    public void init ()
    {
	rF = new DoubleField(20);
	rF.setLabel("Radius");
	hF = new DoubleField(20);
	hF.setLabel("Height");
	b1 = new Button("Compute");
	b1.addActionListener(this);
	VF = new DoubleField(20);
	VF.setLabel("Volume");
	add(rF);
	add(hF);
	add(b1);
	add(VF);
    }

    public void actionPerformed(ActionEvent event)
    {	
	Object cause = event.getSource();
	if (cause == b1)
	{
	     r = rF.getDouble();
	     h = hF.getDouble();
	     V = 3.14159 * r * r * h;
	     VF.setDouble(V);
	}
    }
}