Roman Numerals

roman_numerals.rb

def to_roman(num)
  # Your code here
  roman_hash = { "M"  => 1000,
                 "CM" => 900,
                 "D"  => 500,
                 "CD" => 400,
                 "C"  => 100,
                 "XC" => 90,
                 "L"  => 50,
                 "XL" => 40,
                 "X"  => 10,
                 "IX" => 9,
                 "V"  => 5,
                 "IV" => 4,
                 "I"  => 1
               } 
  roman = ""
  while num != 0
    roman_hash.each_pair do |key,value|
      if num / value >= 1
         roman += key * (num / value) 
         num = num % value
      end 
    end
  end
  roman
end

# Drive code... this should print out trues.
puts to_roman(1) == "I"
puts to_roman(3) == "III"
puts to_roman(6) == "VI"
puts to_roman(1646)
# TODO: what other cases could you add to ensure your to_roman method is working?