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 Ruby (judge verdict: Accepted)

while str = STDIN.gets
  n = str.split(" ")
  r = n[0].to_f
  e = 3.141592653589
 area = r * r * e
 len = 2 * r * e
   print sprintf("%.6f ",area)
   print sprintf("%.6f",len)
end