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.*;
import java.lang.Integer;
import static java.lang.Math.*;
public class Main {
	public static void main(String[] args) {
		try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
			String in  = br.readLine() ;
			double r = Double.parseDouble(in);
			double area = r*r*PI;
			double enshu = 2*r*PI;
			System.out.printf("%5.5f %5.5f", area, enshu );
		} catch ( IOException e ) {
			System.out.println("??¨??????????????????????????????");
		}
	}
}