RomanNumerals

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Anthony Lawrence edited this page Mar 11, 2018 · 2 revisions

Programming Concepts (Kata: Roman Numerals)

Definition of Kata

An individual training exercise (in Karate or other martial art)

Pre-requisite knowledge

Roman Numerals have some very simple rules that should be used when representing numbers.

The following letter/number pairs exist:

I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1,000

A letter placed after another of greater value, adds:

VI = 6 (5 + 1)
XI = 11 (10 + 1)
MDI = 1,501 (1000 + 500 + 1)

A letter placed before another of greater value, substracts:

IV = 4 (5 - 1)
IX = 9 (10 - 1)
IDM = 499 (1000 - 500 - 1)

Test Cases

1 = I
2 = II
3 = III
4 = IV
5 = V
6 = VI
7 = VII
8 = VIII
9 = IX
10 = X
15 = XV
20 = XX
30 = XXX
40 = XL
50 = L
60 = LX
99 = XCIX
100 = C
499 = CDXCIX
500 = D
999 = CMXCIX
1000 = M
1999 = MCMXCIX
2017 = MMXVII