Numbers into Words recursively

gistfile1.rb

module InWords

#The method for turning integers 1-19 into the appropriate strings.
	def under20
		array_under20 = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]
		return array_under20[self]
	end
	
#The method for turning integers 20-99 into the appropriate strings.
	def under100
		_20_99 = ["twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]
		
		first_part = _20_99[(self/10) - 2]
		second_part = (self % 10).under20
		
		return first_part + " " + second_part

	end
#This method turns integers between 100 and 999	into words. For the number in the hundreds place, I just passed the number to the under10 method then added "hundred" to the end.
#For the numbers in the tens and ones place, I 
	def under1000
		first_digit = (self/100).floor
		first_part = first_digit.under20 + " hundred"
		
		if self % 100 == 0
			second_part = ""
		else
			second_part = " " + (self % 100).in_words
		end

		return first_part + second_part
	end

	def under1000000
			first_digit = (self/1000).floor
			first_part = first_digit.in_words + " thousand"

			if self % 1000 == 0
				second_part = ""
			else
				second_part = " " + (self % 1000).in_words
			end

			return first_part + second_part
	end
	
	def in_words
		if (self < 20)
			return self.under20
		end
		
		if (self > 19 && self < 100)
			return self.under100
		end
		
		if (self > 99 && self < 1000)
			return self.under1000
		end

		if (self > 999 && self < 1000000)
			return self.under1000000
		end
	end
end

class Fixnum
	include InWords
end