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From: dave@taurus.UUCP (Dave Lukes)
Newsgroups: net.lang.c
Subject: Re: & operator
Message-ID: <122@taurus.UUCP>
Date: Tue, 20-Dec-83 06:12:26 EST
Article-I.D.: taurus.122
Posted: Tue Dec 20 06:12:26 1983
Date-Received: Sat, 24-Dec-83 10:59:37 EST
References: <481@sdcsla.UUCP> <1064@mit-eddie.UUCP>
Organization: Taurus Technology Ltd, London
Lines: 14

Uh-uh:
	if(*in++ == *in++)

is NOT a sensible way to see if the first two characters of a string are
equal: ask lint, it will say something like: `in: evaluation order undefined'.

Also, for those of little faith, there are actually C compilers that
will take the non-obvious meaning of this (e.g. the PDP-11 cc), and do
the tests then do both increments in one go after the statement,
so BE WARNED,

		Yours in an arbitrary evaluation order
			Dave Lukes
			<United Kingdom>!ukc!hirst1!minotaur!dave