Roman - First pass

gistfile1.rb

#!/usr/bin/env ruby

class Roman

  NUMERALS = {
    1 => 'I',
    5 => 'V',
    10 => 'X',
    50 => 'L',
    100 => 'C',
    500 => 'D',
    1000 => 'M'
  }

  BUCKETS = [1000, 500, 100, 50, 10, 5, 1]

  def self.to_roman(i)
    output = ''
    for bucket in BUCKETS
      while (i >= bucket)
        output += NUMERALS[bucket]
        i -= bucket
      end
    end
    return output
  end

end

for i in 1...100
  puts i.to_s + ": " + Roman.to_roman(i)
end

Output showing the first pass lacks the deduction behavior.

1: I
2: II
3: III
4: IIII
5: V
6: VI
7: VII
8: VIII
9: VIIII
10: X
11: XI
12: XII
13: XIII
14: XIIII
15: XV
16: XVI
17: XVII
18: XVIII
19: XVIIII
20: XX
21: XXI
22: XXII
23: XXIII
24: XXIIII
25: XXV
26: XXVI
27: XXVII
28: XXVIII
29: XXVIIII
30: XXX
31: XXXI
32: XXXII
33: XXXIII
34: XXXIIII
35: XXXV
36: XXXVI
37: XXXVII
38: XXXVIII
39: XXXVIIII
40: XXXX
41: XXXXI
42: XXXXII
43: XXXXIII
44: XXXXIIII
45: XXXXV
46: XXXXVI
47: XXXXVII
48: XXXXVIII
49: XXXXVIIII
50: L