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.math.BigDecimal;
import java.util.Scanner;

public class Main {
	public static void main(String [] args) {
		Scanner stdIn = new Scanner(System.in);
		double S, cir;
		double r = stdIn.nextDouble();
		
		while(0 > r || r > 10000f) {
			r = stdIn.nextDouble();
		}
		
		cir = Math.PI * 2 * r;
		S = Math.PI * r * r;
		
		System.out.println(BigDecimal.valueOf(S).toPlainString() + " " + BigDecimal.valueOf(cir).toPlainString());
		
		
	}
}