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From: jsdy@hadron.UUCP (Joseph S. D. Yao)
Newsgroups: net.lang.c
Subject: Re: *p++ = *p results?
Message-ID: <338@hadron.UUCP>
Date: Thu, 27-Mar-86 00:40:31 EST
Article-I.D.: hadron.338
Posted: Thu Mar 27 00:40:31 1986
Date-Received: Sat, 29-Mar-86 05:57:14 EST
References: <312@imagen.UUCP>
Reply-To: jsdy@hadron.UUCP (Joseph S. D. Yao)
Distribution: net
Organization: Hadron, Inc., Fairfax, VA
Lines: 13
Summary: Only your compiler knows for sure.

In article <312@imagen.UUCP> kevin@imagen.UUCP (Kevin L. Malloy) writes:
>In the statement *p++ = *p; what will be the result?

This kind of thing is specifically defined to be undefined.  Whenever
you have an incremented or decremented variable used elsewhere in the
same expression, the code may be interpreted either way.  If the same
variable is incremented (or decremented) more than once, the code may
be interpreted in any consistent way.
	i = 0;
	printf("%d %d %d %d %d %d\n", i++, i--, i++, i--, i++, i--);
-- 

	Joe Yao		hadron!jsdy@seismo.{CSS.GOV,ARPA,UUCP}