Roman Numerals Exercise

to_roman.rb

  require 'pry'
  # require 'pry-nav'

  def to_roman(num)
     @roman_num = ""
     @num = num
     roman_M(@num)
     roman_D(@num)
     roman_C(@num)
     roman_L(@num)
     roman_X(@num)
     roman_V(@num)
     roman_I(@num)
     @roman_num
  end
   
  def roman_M(num)
       if num >= 900 && num <1_000
        (@roman_num << "DM") 
        @num -=900
      else
        @roman_num << "M"*(num/1000)
        @num = num % 1000
      end
      # binding.pry
  end

  def roman_D(num)
      if num >= 400 && num <500
        (@roman_num << "CD") 
        @num -=400
      else
        @roman_num << "D"*(num/500)
        @num = num % 500
      end
      # binding.pry
  end

   def roman_C(num)
      if num >= 90 && num <100
        (@roman_num << "XC") 
        @num -=90
      else
        @roman_num << "C"*(num/100)
        @num = num % 100
      end
      # binding.pry
  end

  def roman_L(num)

      if num >= 40 && num <50
        (@roman_num << "XL") 
        @num -=40
      else
        @roman_num << "L"*(num/50)
        @num = num % 50
      end
      # binding.pry
  end

  def roman_X(num)

      if num == 9 
        (@roman_num << "IX") 
        @num -=9
      else
        @roman_num << "X"*(num/10)
        @num = num % 10
      end
      # binding.pry

  end

  def roman_V(num)
      if num == 4 
        (@roman_num << "IV") 
        @num -=4
      else
        @roman_num << "V"*(num/5)
        @num = num % 5
      end
      # binding.pry
  end

  def roman_I(num)
    num.times do 
      @roman_num << "I"
    end
    # binding.pry
  end

  # Drive code... this should print out trues.
   
  # puts to_roman(1) == "I"
  # puts to_roman(3) == "III"
  # puts to_roman(6) == "VI"
   
  # TODO: what other cases could you add to ensure your to_roman method is working?
  puts "4 in roman is " + to_roman(4) 
  puts "9 in roman is " + to_roman(9)
  binding.pry
  puts "13 in roman is " + to_roman(13)
  puts "14 in roman is " + to_roman(14)
  puts "44 in roman is " + to_roman(44)
  puts "944 in roman is " + to_roman(944)
  puts "1454 in roman is " + to_roman(1454)
  puts "1646 in roman is " + to_roman(1646)