Coding Dojo UFABC 2/mar/2012

dojo-romanos.py

"""
    >>> romanos(1)
    'I'
    >>> romanos(2)
    'II'
    >>> romanos(3)
    'III'
    >>> romanos(4)
    'IV'
    >>> romanos(5)
    'V'
    >>> romanos(6)
    'VI'
    >>> romanos(7), romanos(8)
    ('VII', 'VIII')
    >>> romanos(10)
    'X'
    >>> romanos(11), romanos(13)
    ('XI', 'XIII')
    >>> romanos(9)
    'IX'
    >>> romanos(14)
    'XIV'
    >>> romanos (15), romanos(18)
    ('XV', 'XVIII')
    >>> romanos(19)
    'XIX'
    >>> romanos(20), romanos(30)
    ('XX', 'XXX')
    >>> romanos(21), romanos(34), romanos(37), romanos(39)
    ('XXI', 'XXXIV', 'XXXVII', 'XXXIX')

"""

def romanos(n):
    ret = ''
    while n > 0:
        if n >= 10 :
            ret += 'X'
            n -= 10
        elif n == 9:
            ret += 'IX'
            n -= 9
        elif n >= 5:
            n -= 5
            ret += 'V'
        elif 1<= n <= 3:
            ret += 'I' * n
            break
        elif n == 4 : 
            ret += 'IV'
            break
        
    return ret
        

import doctest
doctest.testmod()