From: Matthew Moss <matt@...>
Date: 2008-11-25T07:55:39+09:00
Subject: Re: [QUIZ] Befunge (#184)

>>   when :north
>>     @pc[0] = (@pc[0] - 1 + @hgt) % @hgt
> I guess the + @hgt is a nop but ok it makes the reader more
> comfortable with the code :), OTOH it took me
> some time to work it's purpose out.


I tend to do (-1 + h) % h when I don't recall a language's particular  
rules for dealing with negative mod.

In other words, if I don't know that (0-1)%h is safe, I do know that  
(0-1+h)%h is safe and gets me what I want.