Problem:
Circle

Write a program which calculates the area and circumference of a circle for given radius r.

Input

A real number r is given.

Output

Print the area and circumference of the circle in a line. Put a single space between them. The output should not contain an absolute error greater than 10-5.

Constraints

0 < r < 10000

Sample Input 1

2

Sample Output 1

12.566371 12.566371

Sample Input 2

3

Sample Output 2

28.274334 18.849556

Solution in JAVA (judge verdict: Accepted)

import java.util.Scanner;
import java.math.BigDecimal;

public class Main{
	public static void main(String[] args){

		Scanner scan = new Scanner(System.in);

		double r = scan.nextDouble();

		final double CIRCLERATE = 3.141592653589;

		double s = CIRCLERATE * r * r;
		double l = 2 * CIRCLERATE * r;

		BigDecimal x = new BigDecimal(s);
		x = x.setScale(5, BigDecimal.ROUND_HALF_UP);

		BigDecimal y = new BigDecimal(l);
		y = y.setScale(5, BigDecimal.ROUND_HALF_UP);

		System.out.printf("%.5f" + " " + "%.5f", x, y);
	}
}