//////////////////////
// Ruslan Kaybyshev //
// AP Comp Sci      //
// 10/13/2011       //
//////////////////////
// Find Circle Area //
//////////////////////
package pk1;

import java.text.DecimalFormat;
import java.util.Scanner;

public class CircleAreaFinder
{
    public static void main(String[] args)
    {
        // Initialize method of getting input.
        Scanner scanner = new Scanner(System.in);

        // Initialize method of formatting.
        DecimalFormat format = new DecimalFormat("0.00");

        // Declare variables.
        double radius = 0; // circle radius
        double area = 0;   // circle area
        double c = 0;      // circle circumference

        // Get input
        System.out.println("Enter the radius of the circle: ");
        radius = scanner.nextDouble();

        if(radius>=0)
        {
            // Calculate the properties.
            area = Math.PI*radius*radius;
            c = Math.PI*2*radius;

            // Print outputs
            System.out.println("The area is: "+format.format(area));
            System.out.println("The circumference is: "+format.format(c));
        }
        else
        {
            System.out.println("Invalid Input!");
        }
    }
}