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.DecimalFormat;

public class Main{
    public static void main(String args[]){
        Scanner input = new Scanner(System.in);
        DecimalFormat df = new DecimalFormat("#0.000000");
        double r = input.nextDouble();
        double p = Math.PI;
        double s = r*r*p;
        double c = 2*r*p;
        String ss = df.format(s);
        String cc = df.format(c);
        System.out.println(ss + " " + cc);
    }
}