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From: Erstad@HI-MULTICS.ARPA
Newsgroups: mod.computers.apollo
Subject: Cautionary Warning
Message-ID: <860804142032.032289@HI-MULTICS.ARPA>
Date: Mon, 4-Aug-86 10:20:00 EDT
Article-I.D.: HI-MULTI.860804142032.032289
Posted: Mon Aug  4 10:20:00 1986
Date-Received: Wed, 6-Aug-86 02:04:49 EDT
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Approved: apollo@yale-comix.arpa


Regarding the PASCAL evaluation with "guards" on the IF clauses.
Standard PASCAL (If there is such a beast) does not guarantee order of
evalutaion.  Any code which relies upon order of evaluation to work is
certainly non-portable.  DOMAIN Pascal does provide a solution:  Use the
IF x and then Y then construct.  This aloso, of course, is non-portable.

If you want portable, robust code the only option is to use the nested
iff type of thing.  Messy, but guaranteed.