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Groups > comp.lang.c > #10136

Re: Unexpected output

From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: Unexpected output
Date 2011-09-11 11:01 -0700
Organization None to speak of
Message-ID <lnfwk3arg6.fsf@nuthaus.mib.org> (permalink)
References (1 earlier) <743aa762-b7e7-4595-8c95-67ae93433e65@k15g2000yqd.googlegroups.com> <j4gig9$ufd$1@dont-email.me> <ddd0d158-7ebc-4216-9ba9-5409d84015b4@l2g2000vbn.googlegroups.com> <j4gkn9$dd6$1@dont-email.me> <945abad2-7294-4e0a-8dff-76afcd6d27aa@y39g2000prd.googlegroups.com>

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Mazen <neurohacks@gmail.com> writes:
[...]
> I have learned the attempting to assign a value to a variable and
> fetching the value of it in the same expression will produce an
> undefined behaviour.

As Joe Pfeiffer points out, that's not quite correct.

>                      What are some of the other cases that produce
> undefined behaviour? This is interesting!

Grab a copy of the latest C99 draft from

    http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf

and read section J.2.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

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Thread

Unexpected output Mazen <neurohacks@gmail.com> - 2011-09-10 12:36 -0700
  Re: Unexpected output China Blue Corn Chips <chine.bleu@yahoo.com> - 2011-09-10 12:59 -0700
    Re: Unexpected output Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-09-10 16:42 -0400
      Re: Unexpected output Mazen <neurohacks@gmail.com> - 2011-09-10 17:51 -0700
        Re: Unexpected output Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-09-10 20:38 -0600
        Re: Unexpected output pete <pfiland@mindspring.com> - 2011-09-10 22:41 -0400
        Re: Unexpected output Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-09-11 09:35 -0400
          Re: Unexpected output gazelle@shell.xmission.com (Kenny McCormack) - 2011-09-11 13:39 +0000
        Re: Unexpected output "BartC" <bc@freeuk.com> - 2011-09-11 15:26 +0100
      Re: Unexpected output Paul N <gw7rib@aol.com> - 2011-09-11 12:08 -0700
        Re: Unexpected output Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-09-11 17:43 -0400
    Re: Unexpected output Mazen <neurohacks@gmail.com> - 2011-09-10 13:24 -0700
      Re: Unexpected output China Blue Corn Chips <chine.bleu@yahoo.com> - 2011-09-10 15:02 -0700
    Re: Unexpected output Kenneth Brody <kenbrody@spamcop.net> - 2011-09-12 10:01 -0400
  Re: Unexpected output arni <arnmin@gmail.com> - 2011-09-10 13:31 -0700
    Re: Unexpected output Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-09-10 16:49 -0400
      Re: Unexpected output arni <arnmin@gmail.com> - 2011-09-10 14:13 -0700
        Re: Unexpected output Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-09-10 17:26 -0400
          Re: Unexpected output Mazen <neurohacks@gmail.com> - 2011-09-10 17:59 -0700
            Re: Unexpected output Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-09-10 20:52 -0600
              Re: Unexpected output China Blue Corn Chips <chine.bleu@yahoo.com> - 2011-09-10 19:55 -0700
              Re: Unexpected output Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-09-11 06:03 -0700
                Re: Unexpected output James Kuyper <jameskuyper@verizon.net> - 2011-09-11 14:04 -0400
            Re: Unexpected output Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-11 11:22 +0100
            Re: Unexpected output Keith Thompson <kst-u@mib.org> - 2011-09-11 11:01 -0700
              Re: Unexpected output Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-09-13 14:09 +0300
        Re: Unexpected output Seebs <usenet-nospam@seebs.net> - 2011-09-13 06:44 +0000
    Re: Unexpected output "Morris Keesan" <mkeesan@post.harvard.edu> - 2011-09-10 17:16 -0400
  Re: Unexpected output "BartC" <bc@freeuk.com> - 2011-09-10 23:20 +0100
  Re: Unexpected output August Karlstrom <fusionfile@gmail.com> - 2011-09-11 22:55 +0200
    Re: Unexpected output Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-11 22:51 +0100
      Re: Unexpected output pete <pfiland@mindspring.com> - 2011-09-11 22:25 -0400
      Re: Unexpected output August Karlstrom <fusionfile@gmail.com> - 2011-09-12 15:34 +0200
        Re: Unexpected output Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-12 19:55 +0100
          Re: Unexpected output August Karlstrom <fusionfile@gmail.com> - 2011-09-13 19:22 +0200

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