From: Robert Retzbach <rretzbach@...>
Date: 2006-01-08T23:15:54+09:00
Subject: Re: [QUIZ] Dice Roller (#61)

Pierre Barbier de Reuille schrieb:

>Matthew Moss a �crit :
>  
>
>>Wow...  You guys are just having too much fun with
>>"(5d5-4)d(16/d4)+3", I think.  Heck, if y'all know Ruby so well (more
>>than me, cause I'm still such a n00b), you'd be able to swap in loaded
>>dice for random dice and get your min's and max's.  =)
>>
>>Anyway, I just wanted to add a couple of notes.  It was made aware to
>>me that the simplified BNF (in the original post) is slightly in
>>error, in that it allows expressions like this:
>>
>>   3dddd6
>>
>>which is invalid.
>>
>>A couple possible fixes:
>>
>>1. Use the expanded BNF I posted, which doesn't have this fault.
>>2. Implement your dice parser using right-associativity for 'd'
>>operators (but maintain left-assoc for the other binary operators).
>>
>>Feel free to do what you like.
>>
>>
>>    
>>
>
>Well, why do you say it's invalid ? Given the simplified BNF it must be
>read as :
>
>3d(d(d(d6)))
>
>and it is perfectly valid as there is no other way to understand that ...
>
>Pierre
>
>
>  
>
Hmm so that expr has 18 as maximum result with fully loaded dice?

3d(d(d(d6)))
3d(d(d6))
3d(d6)
3d6

=> 18

Is that correct?