Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!accelerator.eng.ohio-state.edu!phao.eng.ohio-state.edu!rob
From: rob@phao.eng.ohio-state.edu (Rob Carriere)
Newsgroups: comp.lang.c
Subject: Re: Unnecessary Macros (was Re: Unnecessary Parenthesis)
Message-ID: <712@accelerator.eng.ohio-state.edu>
Date: 5 Oct 88 17:05:28 GMT
References: <2089@ssc-vax.UUCP> <441@kaon.uchicago.edu> <1401@devsys.oakhill.UUCP> <23@datcon.UUCP> <8577@smoke.ARPA> <8078@haddock.ima.isc.com> <8590@smoke.ARPA> <701@accelerator.eng.ohio-state.edu> <12546@oberon.USC.EDU>
Sender: news@accelerator.eng.ohio-state.edu
Reply-To: rob@phao.eng.ohio-state.edu (Rob Carriere)
Distribution: na
Organization: Ohio State Univ, College of Engineering
Lines: 14

In article <12546@oberon.USC.EDU> english@stromboli.usc.edu (Joe English) 
writes:
>In article <701@accelerator.eng.ohio-state.edu> rob@kaa.eng.ohio-state.edu
>(Rob Carriere) writes:
>>I *don't* want to write [in some inner loop]
>>foo = sin( x )*sin( x ) + 1.7;
>Why not?  Unless you're using square() for legibility, the macro
>expansion is going to be sin(x) * sin(x) anyway.

That was the point of the original discussion.  Needlessly evaluating
transcendental functions twice is generally frowned upon in numerical
circles. 

Rob Carriere