roman.rb

puts "Give me a number between 0 and 3000!"
number = gets.chomp.to_i

loop {if number >= 1000
  thousand = number / 1000
  print "M"*thousand
  number = number % 1000
elsif number >= 900
  print "CM"
  number = number - 900
elsif number >= 500
  print "D"
  number = number - 500
elsif number >= 400
  print "CD"
  number = number - 400
elsif number >= 100
  hundred = number / 100
  print "C" * hundred
  number = number % 100
elsif number >= 90
  print "XC"
  number = number - 90
elsif number >= 50
  print "L"
  number = number - 50
elsif number >= 40
  print "XL"
  number = number - 40
elsif number >= 10
  ten = number / 10
  print "X" * ten
  number = number % 10
elsif number >= 9
  print "IX"
  number = number - 9
elsif number >= 5
  print "V"
  number = number - 5
elsif number >= 4
  print "IV"
  number = number - 4
elsif number >= 1
  print "I" * number
  number = 0
else
  break
end}
puts