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;

class Main {

	public void ci(){

		Scanner sc = new Scanner(System.in);

		double r,S,O;

		r = sc.nextDouble();

		S = r * r * 3.141592653589;

		O = 2 * r * 3.141592653589;

		System.out.printf("%2.6f %2.6f\n",S,O);

	}

	public static void main(String[] args){

		new Main().ci();

	}

}