roman_numerals.rb

def to_roman(num)
  roman_numerals = {
    1000   => "M",
    900    => "CM",
    500    => "D",
    400    => "CD",
    100    => "C",
    90     => "XC",
    50     => "L",
    40     => "XL",
    10     => "X",
    9      => "IX",
    5      => "V",
    4      => "IV",
    1      => "I"
  }

  roman_number = ""

  roman_numerals.each do |arabic, roman|
    factor = num / arabic
    roman_number << roman * factor
    num -= arabic * factor
  end

  roman_number
end



  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)}"