Converts the numbers from 1 to 10k to german words, and sorts them alphabetically

GC4WF1G.rb

#! /usr/bin/env ruby

# Encoding: utf-8

output = Array.new

10000.times do |zahl|
  zahl = zahl+1
  array = zahl.to_s.scan(/./)
  string = ""
  if array.length == 1
    einer = array[0]
  elsif array.length == 2
    zehner = array[0]
    einer = array[1]
  elsif array.length == 3
    hunderter = array[0]
    zehner = array[1]
    einer = array[2]
  elsif array.length == 4
    tausender = array[0]
    hunderter = array[1]
    zehner = array[2]
    einer = array[3]
  elsif array.length == 5
    string = "zehntausend"
  end
  if string.eql? ""
    unless tausender.nil?
      case tausender
      when "1"
      string = string+"eintausend"
      when "2"
        string = string+"zweitausend"
      when "3"
        string = string+"dreitausend"
      when "4"
        string = string+"viertausend"
      when "5"
        string = string+"fünftausend"
      when "6"
        string = string+"sechstausend"
      when "7"
        string = string+"siebentausend"
      when "8"
        string = string+"achttausend"
      when "9"
        string = string+"neuntausend"
      end
    end
    unless hunderter.nil?
      case hunderter
      when "1"
      string = string+"einhundert"
      when "2"
        string = string+"zweihundert"
      when "3"
        string = string+"dreihundert"
      when "4"
        string = string+"vierhundert"
      when "5"
        string = string+"fünfhundert"
      when "6"
        string = string+"sechshundert"
      when "7"
        string = string+"siebenhundert"
      when "8"
        string = string+"achthundert"
      when "9"
        string = string+"neunhundert"
      end
    end
    unless einer.nil?
      if (!zehner.nil? && zehner == "1")
        if einer.eql? "1"
          string = string+"elf"
        elsif einer.eql? "2"
          string = string+"zwölf"
        end
      elsif (!zehner.nil? && einer == "1")
        string = string+"ein"
      else
        case einer
        when "1"
          string = string+"eins"
        when "2"
          string = string+"zwei"
        when "3"
          string = string+"drei"
        when "4"
          string = string+"vier"
        when "5"
          string = string+"fünf"
        when "6"
          string = string+"sechs"
        when "7"
          string = string+"sieben"
        when "8"
          string = string+"acht"
        when "9"
          string = string+"neun"
        end
      end
    end
    unless zehner.nil?
      if (!einer == "" && (einer == "1" || einer == "2") && zehner == "1")
        string = string + ""
      else
        case zehner
        when "1"
        string = string+"zehn"
        when "2"
          string = string+"undzwanzig"
        when "3"
          string = string+"unddreißig"
        when "4"
          string = string+"undvierzig"
        when "5"
          string = string+"undfünfzig"
        when "6"
          string = string+"undsechzig"
        when "7"
          string = string+"undsiebzig"
        when "8"
          string = string+"undachtzig"
        when "9"
          string = string+"undneunzig"
        end
      end
    end
  end
  output.push(string)
end

output.sort!

output.each do |word|
  puts word
end