roman_numerals.rb

def convert_to_roman(arabic, options={})
num = arabic
  numeral = ""
    $letters.each do |key,value|
      numeral += value * (num/key)
      num -= key * (num/key)
    end

  if options.has_key?(:modern) && options[:modern] == true
    $modern_letters.each do |old_nums, new_nums|
      numeral.sub!(old_nums, new_nums)
    end
  end

p numeral
end

convert_to_roman(204, {:modern => true})