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From: phils@chaos.cs.brandeis.edu (Phil Shapiro)
Newsgroups: comp.sys.mac.programmer
Subject: Re: THINK Pascal expression quirk
Message-ID: <PHILS.90Apr12181304@chaos.cs.brandeis.edu>
Date: 12 Apr 90 22:13:04 GMT
References: <16954@eagle.wesleyan.edu>
Sender: @chaos.cs.brandeis.edu
Organization: Brandeis University Computer Science Dept
Lines: 10
In-Reply-To: rcook@eagle.wesleyan.edu's message of 12 Apr 90 11:17:17 GMT

If you don't put on overflow checking (the V flag in the project menu,
or {$V+} in your program) then THINK Pascal will happily overflow your
integers into their sign bits.  The compiler parses the operators '*'
and '/' (which have the same precedence) from left to right, so it
compiled the multiply operation before the divide.  You could promote
one of the operands into a longint; this will prevent the integer
overflow.
--
Phil Shapiro
phils@chaos.cs.brandeis.edu