Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site mtxinu.UUCP Path: utzoo!watmath!clyde!bonnie!akgua!sdcsvax!sdcrdcf!hplabs!hpda!fortune!amdcad!amd!dual!unisoft!mtxinu!ed From: ed@mtxinu.UUCP (Ed Gould) Newsgroups: net.lang.c Subject: Re: YAAO (yet another assignment operator) Message-ID: <189@mtxinu.UUCP> Date: Wed, 26-Dec-84 16:52:22 EST Article-I.D.: mtxinu.189 Posted: Wed Dec 26 16:52:22 1984 Date-Received: Sat, 29-Dec-84 02:39:19 EST References: <209@cmu-cs-k.ARPA> <529@vu44.UUCP> <6616@brl-tgr.ARPA> <582@mulga.OZ> Organization: mt Xinu, Berkeley, CA Lines: 16 > ... > Consider that > X= Y; (call this form 1) > is exactly the same statement as > X = X Y; (call this form 2) > ... But, of course, form 1 and form 2 are not quite the same thing. The semantic difference is that in form 1 X is evaluated once, and it's evaluated twice in 2. If there are side effects, this can cause great damage to the algorithm. So, just translating 1 into 2 isn't right. -- Ed Gould {ucbvax,decvax}!mtxinu!ed