in_words - hundreds

in_words.rb

module InWords 
def in_words
    numberString = ""
    numToLettersHash = {0 => "", 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 => "forty", 50 => "fifty", 60 => "sixty", 70 => "seventy", 80 => "eighty", 90 => "ninety",}
    if self < 20 
        return numberString = numToLettersHash[self]
    elsif self    < 100
        return numberString = numToLettersHash[self-(self%10)] + " " + numToLettersHash[self%10]
    elsif (self%100) < 20
        return numberString = numToLettersHash[(self-(self%100))/100] + " hundred " + numToLettersHash[self%100]
    elsif self < 1000
        return numberString = numToLettersHash[(self-(self%100))/100] + " hundred " + numToLettersHash[(self%100)-(self%10)] + " " + numToLettersHash[self%10]
    end  
  end 
end

class Fixnum
 include InWords
end