in_words

in_words

module InWords
  def in_words
    ones = ["", "one","two","three","four","five","six","seven","eight","nine"]
    tens = ["","","twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety","ten","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"]
    big_nums = ["hundred","thousand", "million", "billion",]

    numStr = self.to_s
    numLength = numStr.length
    word = ""

    if self == 1000000000000
      return "one trillion"
    end
    if numLength == 1
      [ones[self]].join(" ").rstrip
    else
      # Check for teens
      if (numLength == 2 || numLength == 5 || numLength == 8 || numLength == 11) && (numStr[0] == "1")
        case numLength
        when 2
          [tens[numStr[0,2].to_i]].join(" ").rstrip
        when 5
          [tens[numStr[0,2].to_i],big_nums[1],numStr[2,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 8
          [tens[numStr[0,2].to_i],big_nums[2],numStr[2,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 11
          [tens[numStr[0,2].to_i],big_nums[3],numStr[2,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        end

      else
        case numLength
        when 2
          [tens[numStr[0].to_i],numStr[1,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 3
          [ones[numStr[0].to_i],big_nums[0],numStr[1,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 4
          [ones[numStr[0].to_i],big_nums[1],numStr[1,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 5
          [tens[numStr[0].to_i],ones[numStr[1].to_i],big_nums[1],numStr[2,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 6
          [ones[numStr[0].to_i],big_nums[0],numStr[1,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 7
          [ones[numStr[0].to_i],big_nums[2],numStr[1,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 8
          [tens[numStr[0].to_i],ones[numStr[1].to_i],big_nums[2],numStr[2,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 9
          [ones[numStr[0].to_i],big_nums[0],numStr[1,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 10
          [ones[numStr[0].to_i],big_nums[3],numStr[1,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 11
          [tens[numStr[0].to_i],ones[numStr[1].to_i],big_nums[3],numStr[2,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        when 12
          [ones[numStr[0].to_i],big_nums[0],numStr[1,numLength].to_i.in_words].join(" ").rstrip.gsub("  "," ")
        end
      end
    end
  end
end

class Fixnum
  include InWords
end