数字转换成罗马数字

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# Hash holding the roman values
# Values above 3999 are not accepted,as numerals with bars are required.
roman_map = Hash[ 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"]

print "Enter number> "
arabic = gets.chomp.to_i
if arabic < 4000
  # Sort the keys,highest value (1000) first,then descending,# and parse values
  roman_map.keys.sort{ |a,b| b <=> a }.each do
    |n|
    # get roman numeral until the arabic number is too small,# in which case we'll try the smaller roman values
    while arabic >= n
      arabic = arabic-n
      print roman_map[n]
    end
  end
else 
  puts "Please enter number lower than 3999."
end

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