import javax.swing.JOptionPane;


public class ComputeArea4 {
    public static void main(String[] args) {
	final double PI = 3.14159;
	double radius;
	double area;
	String areaStr;
		  
	String radiusStr = JOptionPane.showInputDialog(null,"Enter the radius: ");
		  
	radius = Double.parseDouble(radiusStr);
	area = radius * radius * PI;
		  
	areaStr = String.format("%.2f", area);
	JOptionPane.showMessageDialog(null, "The area for a circle with radius " +
	    radius + " is " + areaStr);
    }
}