Script in ruby to return number for six digits as spanish text. Use it for example to generate invoices.

number_as_spanish_text.rb

def unity_or_especial(n, separator=nil)
  case n
  when 1
    if separator.nil?
      return 'UNO'
      #return 'UN'
    else
      return ''
    end
  when 2
    if separator.nil?
      return 'DOS'
    else
      return 'DOS '
    end
  when 3
    if separator.nil?
      return 'TRES'
    else
      return 'TRES '
    end
  when 4
    if separator.nil?
      return 'CUATRO'
    else
      return 'CUATRO '
    end
  when 5
    if separator.nil?
      return 'CINCO'
    else
      return 'CINCO '
    end
  when 6
    if separator.nil?
      return 'SEIS'
    else
      return 'SEIS '
    end
  when 7
    if separator.nil?
      return 'SIETE'
    else
      return 'SIETE '
    end
  when 8
    if separator.nil?
      return 'OCHO'
    else
      return 'OCHO '
    end
  when 9
    if separator.nil?
      return 'NUEVE'
    else
      return 'NUEVE '
    end
  when 10
    return 'DIEZ'
  when 11
    return 'ONCE'
  when 12
    return 'DOCE'
  when 13
    return 'TRECE'
  when 14
    return 'CATORCE'
  when 15
    return 'QUINCE'
  when 16
    return 'DIECISÉIS'
  when 17
    return 'DIECISIETE'
  when 18
    return 'DIECIOCHO'
  when 19
    return 'DIECINUEVE'
  when 20
    return 'VEINTE'
  when 21
    return 'VEINTIÚN'
  when 22
    return 'VEINTIDÓS'
  when 23
    return 'VEINTITRÉS'
  when 24
    return 'VEINTICUATRO'
  when 25
    return 'VEINTICINCO'
  when 26
    return 'VEINTISÉIS'
  when 27
    return 'VEINTISIETE'
  when 28
    return 'VEINTIOCHO'
  when 29
    return 'VEINTINUEVE'
  else
    return ''
  end
end

def hundred(n, o, p)
  case n
  when 1
    if o == 0 and p == 0
      return 'CIEN'
    else
      return 'CIENTO'
    end
  when 2
    return 'DOSCIENTOS'
  when 3
    return 'TRESCIENTOS'
  when 4
    return 'CUATROCIENTOS'
  when 5
    return 'QUINIENTOS'
  when 6
    return 'SEISCIENTOS'
  when 7
    return 'SETECIENTOS'
  when 8
    return 'OCHOCIENTOS'
  when 9
    return 'NOVECIENTOS'
  else
    return ''
  end
end

def ten(n, unity)
  case n
  when 3
    text = 'TREINTA'
    if unity > 0
      text += ' Y ' + unity_or_especial(unity)
    end
    return text
  when 4
    text = 'CUARENTA'
    if unity > 0
      text += ' Y ' + unity_or_especial(unity)
    end
    return text
  when 5
    text = 'CINCUENTA'
    if unity > 0
      text += ' Y ' + unity_or_especial(unity)
    end
    return text
  when 6
    text = 'SESENTA'
    if unity > 0
      text += ' Y ' + unity_or_especial(unity)
    end
    return text
  when 7
    text = 'SETENTA'
    if unity > 0
      text += ' Y ' + unity_or_especial(unity)
    end
    return text
  when 8
    text = 'OCHENTA'
    if unity > 0
      text += ' Y ' + unity_or_especial(unity)
    end
    return text
  when 9
    text = 'NOVENTA'
    if unity > 0
      text += ' Y ' + unity_or_especial(unity)
    end
    return text
  else
    if n == 1 or n == 2
      text = unity_or_especial(n * 10 + unity)
    else
      text = unity_or_especial(unity)
    end
    return text
  end
end

thousands_separator = 'MIL'

number = gets.chomp.to_i

split_number = number.to_s.split('')

number_size = split_number.size

position = number_size
_text = ''
split_number.each do |t|
  position -= 1
  case position
  when 1
    # puts '-'*117
    # puts position
    # puts '-'*117
    if number_size > position + 1
      space = ' '
    else
      space = ''
    end
    _text += space + ten(t.to_i, split_number[number_size - position].to_i)
    puts _text
    break
  when 2
    # puts '-'*117
    # puts position
    # puts '-'*117
    if number_size > position + 1
      space = ' '
    else
      space = ''
    end
    _text += space + hundred(t.to_i, split_number[number_size - position].to_i, split_number[number_size - position + 1].to_i)
  when 3
    # puts '-'*117
    # puts position
    # puts '-'*117
    if number_size > position + 1
      space = ' '
    else
      space = ''
    end
    if number_size == 3
      _text += space + unity_or_especial(t.to_i, thousands_separator) + thousands_separator
    else
      _text += space + thousands_separator
    end
  when 4
    # puts '-'*117
    # puts ten(1, 2)
    # puts '-'*117
    if number_size > position + 1
      space = ' '
    else
      space = ''
    end
    _text += space + ten(t.to_i, split_number[number_size - position].to_i)
  when 5
    # puts '-'*117
    # puts position
    # puts '-'*117
    if number_size > position + 1
      space = ' '
    else
      space = ''
    end
    _text += space + hundred(t.to_i, split_number[number_size - position].to_i, split_number[number_size - position + 1].to_i)
  else
    # puts '-'*117
    # puts position
    # puts '-'*117
    _text = unity_or_especial(t.to_i)
    puts _text
    break
  end
end