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From: eli@smectos.gang.umass.edu (Eli Brandt)
Newsgroups: comp.lang.pascal
Subject: Re: Fields on the screen for a DataBase
Message-ID: <24072@dime.cs.umass.edu>
Date: 14 Dec 90 20:54:07 GMT
References: <259.275a4a92@zodiac.rutgers.edu> <95@bart.cs.mcgill.ca>
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Reply-To: eli@smectos.CS.UMASS.EDU (Eli Brandt)
Organization: University of Massachusetts, Amherst
Lines: 19

In article <95@bart.cs.mcgill.ca> einstein@quiche.cs.mcgill.ca (Michael CHOWET) writes:
>In article <259.275a4a92@zodiac.rutgers.edu> mshah@zodiac.rutgers.edu writes:
>

 [discussion of fields stored in array deleted]

>  Now comes something a little tricky for beginners to Pascal. How do you
>jump from the last field to the first? You could use an IF, but that isn't
>elegant, and would probably go slower (but hey, who'd notice on a 
>Cray, anyways?? :-). Instead, have you incrementer make use of a mod 
>statement. The use would be something like 
>  Point := ( Point + 1 ) Mod Number_Of_Fields ;
>
>  You will probably need an if for a decrement, though.
>

One problem with using _mod_ here is that it's slower than _if_.  Relative
elegance is, I suppose, a matter of taste.  When you use _if_ it's a little
clearer what you're trying to do, though.