Xref: utzoo comp.lang.c:15506 comp.lang.c++:2424
Path: utzoo!attcan!uunet!mcvax!enea!kth!draken!Urd!newsuser
From: newsuser@LTH.Se (LTH network news server)
Newsgroups: comp.lang.c,comp.lang.c++
Subject: Re: Would *you* get caught by this one?
Keywords: Assignops
Message-ID: <1989Jan13.085902.2057@LTH.Se>
Date: 13 Jan 89 07:59:01 GMT
References: <139@mole-end.UUCP>
Reply-To: dag@Control.LTH.Se (Dag Bruck)
Organization: Dept. of Automatic Control, Lund Inst. of Technology, Sweden
Lines: 24

In article <139@mole-end.UUCP> mat@mole-end.UUCP (Mark A Terribile) writes:
>
>	When is     a *= b      not the same as     a = a * b   ?

For example, if you have:

	#define b x + y

then:

	a *= b		<=> 	a *= (x + y)
	a = a * b	<=>	a = (a * x) + y

I strongly recommend the following book:

	Andrew Koenig: ``C Traps and Pitfalls'', Addison-Wesley Publishing
	Company, 1989. ISBN 0-201-17928-8.

Dag Bruck
-- 
Department of Automatic Control		Internet:  dag@control.lth.se
Lund Institute of Technology
P. O. Box 118				Phone:	+46 46-108779
S-221 00 Lund, SWEDEN			Fax:    +46 46-138118