Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!rutgers!mit-eddie!genrad!panda!teddy!jpn
From: jpn@teddy.UUCP
Newsgroups: comp.lang.c
Subject: Re: short circuit evaluation
Message-ID: <3721@teddy.UUCP>
Date: Wed, 28-Jan-87 17:36:14 EST
Article-I.D.: teddy.3721
Posted: Wed Jan 28 17:36:14 1987
Date-Received: Fri, 30-Jan-87 00:47:59 EST
References: <425@bobkat.UUCP> <102600001@datacube> <34@umich.UUCP> <14479@amdcad.UUCP> <5199@mimsy.UUCP>
Reply-To: jpn@teddy.UUCP (John P. Nelson)
Organization: GenRad, Inc., Concord, Mass.
Lines: 20

Why is there so much misinformation in this group?!?!  I wish people who
don't know what they are talking about would not post here!

>I can find no promise in K&R that bitwise expressions are not short
>circuited even in the presence of side effects.

60 seconds with my copy of K&R yeilds this (Appendix A):

  "The & operator is associative and expressions involving & may be rearranged"

  "Unlike &, && guarantees left-to-right evaluation; moreover, the second
   operand is not evaluated if the first operand is zero"

>In any case, I would advise not counting on full evaluation (of bitwise). 

True, it is not explitly stated that & and | are not short circuited.  It
also doesn't explicitly say that + and * are not short circuited!  However
&& and || are EXPLICITY defined as having short circuit behavier, no other
operators are described this way, so it is safe to assume that all other
operators do NOT short-circuit.