roman_numerals.rb

VALUES = [
  ["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] 
]

def to_roman(num)
  # Your code here
  roman = ""

  VALUES.each do |pair|
    letter = pair[0]
    value = pair[1]
    roman += letter*(num / value)
    num = num % value
  end
  return roman
end
 
# Drive code... this should print out trues.
puts "My totally sweet testing script"
puts ""
puts "input | expected | actual"
puts "------|----------|-------"
puts "4     | IV       | #{to_roman(4)}"
puts "9     | IX       | #{to_roman(9)}"
puts "13    | XIII     | #{to_roman(13)}"
puts "1453  | MCDLIII  | #{to_roman(1453)}"
puts "1646  | MDCXLVI  | #{to_roman(1646)}"
# TODO: what other cases could you add to ensure your to_roman method is working?