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: Wrong Answer)

import java.util.Scanner;
class Main {
 public static void main(String[] args){
  Scanner s = new Scanner(System.in);
  double a = s.nextDouble();
  double x = (a * a) * Math.PI;
  double y = (a * 2) * Math.PI;
  System.out.println(x + " " + y);
 }
}