Great. My only question is why is 49 translated to IL (and vice versa)? According to the rules I know, along with those of Math::Roman and Roman, this is illegal. And if it were legal, shouldn't IC, ID, and IM be legal, too?

Note: I understand the idea of the symbolic approach, so that such things as inc('IM') return M (so, in this sense, IM is "legal" input, but not the expected output for dec('M') --- this is what I mean by "legal"). I just thought that inc('IL') should return L as expected, but dec('L') should return XLIX. (Note, similarly, that decrementing D ten times returns CDXC and not XD.)

In reply to Re: symbolic increment/decrement of roman numerals by kaif
in thread symbolic increment/decrement of roman numerals by PetaMem

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