numbers_to_words

numbers_to_words.rb

class NumbersToWords
  @@words = { 1=> "one",
             2=>"two",
             3=>"three",
             4=>"four",
             5=>"five",
             6=>"six",
             7=>"seven",
             8=>"eight",
             9=>"nine",
             10=>"ten",
             11=>"eleven",
             12=>"twelve",
             13=>"thirteen",
             14=>"fourteen",
             15=>"fifteen",
             16=>"sixteen",
             17=>"seventeen",
             18=>"eighteen",
             19=>"nineteen",
             20=>"twenty",
             30=>"thirty",
             40=>"fourty",
             50=>"fifty",
             60=>"sixty",
             70=>"seventy",
             80=>"eighty",
             90=>"ninety",
            100=>"hundred",
            1000=>"thousand",
            1000000=>"million"
          }

  def self.in_words(number, word = "")
    return "one" if number == 1
    highest_key = @@words.keys.select {|i| i <= number}.sort.reverse[0]
    multiple = number / highest_key
    remainder = number % highest_key
    result = ""
    result += self.in_words(multiple).to_s + " " if number > 99
    result += @@words[highest_key].to_s
    result += " " + self.in_words(remainder).to_s if remainder > 0
    result
  end

end