def englishnumber number
  recursiveenglishnumber number, 0
end

def recursiveenglishnumber number, place

undertwenty= ['zero', 'one', 'two', 'three',
'four', 'five', 'six',
'seven', 'eight', 'nine', 'ten',
'eleven', 'twelve', 'thirteen',
'fourteen', 'fifteen', 'sixteen',
'seventeen', 'eighteen', 'nineteen']

tens_place = ['twenty', 'thirty',
'forty', 'fifty', 'sixty',
'seventy', 'eighty', 'ninety']

threezeros = [' thousand', ' million', ' billion', ' trillion', ' quadrillion']

  #puts 'entering function with place of ' + place.to_s
  if number < 0
    return 'Please enter a positive number'
  elsif number==0 && place==0
    return 'zero'
  end
  answer = String.new
  if number > 999
    #puts 'recursion at ' + number.to_s + ' passing in ' + (number/1000).to_s
    answer = recursiveenglishnumber (number/1000), (place+1)
  end

  number %= 1000
  if number/100 > 0
   # answer = String.new
    answer = answer.to_s + undertwenty[number/100].to_s
    answer += " hundred "
    number%=100
  end

  if number < 20 && number !=0
    #puts answer
    #puts undertwenty[number]
    answer += undertwenty[number]
  elsif number >= 20
    answer += tens_place[number/10-2]
    if number%10!=0
      answer+='-'
      answer+=undertwenty[number%10]
    end
  end
  if place > 0
    answer+=threezeros[place-1]
    answer+=' '
  end
  return answer
end

puts "Give a number: "
i = gets.chomp.to_i
while i >=0
  puts englishnumber i
  i -=1
end