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 Scala (judge verdict: Accepted)

import scala.io.StdIn.readLine
import scala.math.Pi

object Main {
	def main(args: Array[String]) = {
		val r = io.StdIn.readLine.split(" ").map(_.toDouble)
		printf("%.6f %.6f\n", r(0)*r(0)*math.Pi, 2*r(0)*math.Pi)
	}
}