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.*;
import java.text.*;
public class Main {
	public static void main(String[] args){
		Scanner in = new Scanner(System.in);
		double r = in.nextDouble();
		double s = r*r*Math.PI;
		double l = r*2*Math.PI;
		DecimalFormat fm = new DecimalFormat("#.######");
		System.out.println(fm.format(s)+" "+fm.format(l));
	}
}