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;

public class Main {
	public static void main(String[] args) {
		//変数の宣言
		double r;
		double Area,Length;
		//値の入力
		//System.out.println("Please input r:");
		Scanner sc = new Scanner(System.in);
		r=sc.nextDouble();
		//計算
		Area=Math.PI*r*r;
		Length=2*Math.PI*r;
		//結果の表示
		System.out.println(String.format("%08f", Area)+" "+String.format("%08f", Length));
	}
}