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class RomanNumerals
NUMBERS = {
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",
}
def convert number
amount, symbol = NUMBERS.detect {|k,v| k <= number }
amount == number ? symbol : symbol + convert(number - amount)
end
end
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