examples/rosettacode/factorial.nit

   1 #!/usr/bin/env nit
   2 #
   3 # This file is part of NIT ( http://www.nitlanguage.org ).
   4 # This program is public domain
   5
   6 # Task: Factorial
   7 # SEE: <http://rosettacode.org/wiki/Factorial>
   8
   9 module factorial
  10
  11 redef class Int
  12
  13     fun fact: Int
  14     do
  15         if self < 1 then return 1
  16         return self * (self-1).fact
  17     end
  18 end
  19 var n = gets.to_i
  20 print n.fact