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From: russotto@eng.umd.edu (Matthew T. Russotto)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Think C Preprocessor Question
Message-ID: <1990Oct25.175052.10355@eng.umd.edu>
Date: 25 Oct 90 17:50:52 GMT
References: <13065@crdgw1.crd.ge.com>
Sender: news@eng.umd.edu (The News System)
Organization: College of Engineering, Maryversity of Uniland, College Park
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In article <13065@crdgw1.crd.ge.com> darweesh@zephyrus.crd.ge.com (Michael Darweesh) writes:
>A simple question for those of you who know.  Probably I should have posted
>to a more general C board, but here it goes.
>
>Does the C preprocessor ever do any calculations or does it only do search
>and replace?  This question is very confusing and demands an example:
>
>#define foo 5
>#define bar 8
>#define baz ((foo * bar) >> 1)
>
>integer=baz;
>
>Basically, what I want to know is this...
>Can I make the C preprocessor (specifically Think C) actually calculate
>the value for baz at compile time?
>I would like to be able to use this syntax to define baz as 20 instead of 
>((foo * bar) >> 1).

The C preprocessor doesn't do any calculation, but the C compiler in many
'C's (including THINK, I think) will evaluate constant expressions at
compile time, giving you the same effect.
--
Matthew T. Russotto	russotto@eng.umd.edu	russotto@wam.umd.edu
Tax the rich, and feed the poor -- until there are, rich no more.