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From: franka@mmintl.UUCP (Frank Adams)
Newsgroups: net.lang.c
Subject: Re: Long Longs
Message-ID: <1170@mmintl.UUCP>
Date: Wed, 5-Mar-86 14:40:49 EST
Article-I.D.: mmintl.1170
Posted: Wed Mar  5 14:40:49 1986
Date-Received: Mon, 10-Mar-86 00:09:46 EST
References: <1434@brl-smoke.ARPA>
Reply-To: franka@mmintl.UUCP (Frank Adams)
Organization: Multimate International, E. Hartford, CT
Lines: 29

In article <1434@brl-smoke.ARPA> jon@cit-vax.ARPA (Jonathan P. Leech) writes:
>    Final cautionary note: [ from K&R Appendix	A  Sec.   7  (pg  185)
>Expressions ]:
>
>   "... Expressions involving a commutative and  associative  operator
>    (*, +, &, |,  ^)  may  be  rearranged  arbitrarily,  even  in  the
>    presence of parentheses; to force a particular order of evaluation
>    an explicit temporary must be used."

This would let the compiler rearrange

   a = (b * c) * d;

to

   a = b * (c * d);

but it does not permit

   a = (b * c) / d;

to be rearranged to

   a = b * (c / d);

at least if b, c, and d are of integral type.

Frank Adams                           ihnp4!philabs!pwa-b!mmintl!franka
Multimate International    52 Oakland Ave North    E. Hartford, CT 06108