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.io.*;
public class Main {
    public static void main(String[] args){
        try{
            BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
            String line = reader.readLine();
            double r=Double.parseDouble(line);
            System.out.printf("%.6f %.6f\n",Math.PI*r*r, 2*Math.PI*r);
        }
        catch(IOException e){
        }
    }
}