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From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.lang.c
Subject: Re: C question
Message-ID: <5434@utzoo.UUCP>
Date: Sat, 6-Apr-85 19:49:40 EST
Article-I.D.: utzoo.5434
Posted: Sat Apr  6 19:49:40 1985
Date-Received: Sat, 6-Apr-85 19:49:40 EST
References: <5272@tektronix.UUCP>
Organization: U of Toronto Zoology
Lines: 13

Note that section 7 of K&R Appendix A says explicitly that the order
of side effects within an expression is undefined and is up to the
compiler.  The ANSI C-standard drafts contain similar although more
elaborate wording.  The value of x after:

	x = 5;
	x = x++;

is not 5 or 6, it is "5 or 6".  It is most unwise to write code that
relies on one particular choice.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry