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Groups > comp.lang.c > #6098

Re: offset 1 list indexing

From jacob navia <jacob@spamsink.net>
Newsgroups comp.lang.c
Subject Re: offset 1 list indexing
Date 2011-06-15 12:01 +0200
Organization lccwin
Message-ID <it9vtt$jus$1@speranza.aioe.org> (permalink)
References <rubrum-E97163.21022514062011@news.albasani.net>

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Le 15/06/11 06:02, Michael Press a écrit :
> I want to index into a list using offset one indexing.
> The obvious thing to do is make a pointer that points
> one element before the list.
>
> void work_on_stuff(int *offset0, int length)
> {
>      int offset1 = offset0 - 1;
>
>      for(idx = 1; idx<= length; idx++)
>      {
>           ... offset1[idx] ...
>      }
> }
>
> Is this likely to fail? Possible to fail?
> Very unlikely to fail? Not guaranteed by the standard?
>

Another evident way is to leave element zero unused and avoid
all problems... Why is that impossible?

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Thread

offset 1 list indexing Michael Press <rubrum@pacbell.net> - 2011-06-14 21:02 -0700
  Re: offset 1 list indexing Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-06-14 21:29 -0700
  Re: offset 1 list indexing Nobody <nobody@nowhere.com> - 2011-06-15 05:58 +0100
  Re: offset 1 list indexing Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-15 02:51 -0700
  Re: offset 1 list indexing jacob navia <jacob@spamsink.net> - 2011-06-15 12:01 +0200
    Re: offset 1 list indexing gwowen <gwowen@gmail.com> - 2011-06-15 03:55 -0700
  Re: offset 1 list indexing Mark Bluemel <mark_bluemel@pobox.com> - 2011-06-15 11:07 +0100
    Re: offset 1 list indexing Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-06-15 07:30 -0700
      Re: offset 1 list indexing Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-06-15 11:19 -0600
        Re: offset 1 list indexing James Kuyper <jameskuyper@verizon.net> - 2011-06-15 22:57 -0400
        Re: offset 1 list indexing Joseph Huber <joseph.huber@NOREPLY.web.de> - 2011-06-16 09:28 +0200
          Re: offset 1 list indexing Angel <angel+news@spamcop.net> - 2011-06-16 15:05 +0000
          Re: offset 1 list indexing jacob navia <jacob@spamsink.net> - 2011-06-24 01:14 +0200
      Re: offset 1 list indexing Michael Press <rubrum@pacbell.net> - 2011-06-15 15:33 -0700
    Re: offset 1 list indexing Michael Press <rubrum@pacbell.net> - 2011-06-15 15:28 -0700
      Re: offset 1 list indexing Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-15 23:34 -0400
        Re: offset 1 list indexing Michael Press <rubrum@pacbell.net> - 2011-06-15 21:42 -0700
          Re: offset 1 list indexing Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-16 08:18 -0400
            Re: offset 1 list indexing James Kuyper <jameskuyper@verizon.net> - 2011-06-16 08:32 -0400
              Re: offset 1 list indexing Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-06-16 06:29 -0700
                Re: offset 1 list indexing James Kuyper <jameskuyper@verizon.net> - 2011-06-16 09:43 -0400
              Re: offset 1 list indexing Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-16 20:50 -0400
                Re: offset 1 list indexing James Kuyper <jameskuyper@verizon.net> - 2011-06-17 08:56 -0400
                Re: offset 1 list indexing cri@tiac.net (Richard Harter) - 2011-06-17 15:11 +0000
            Re: offset 1 list indexing Michael Press <rubrum@pacbell.net> - 2011-06-16 23:54 -0700
              Re: offset 1 list indexing Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-06-23 21:45 +0300
                Re: offset 1 list indexing Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-25 09:30 -0700
                Re: offset 1 list indexing pete <pfiland@mindspring.com> - 2011-06-25 13:10 -0400
                Re: offset 1 list indexing cri@tiac.net (Richard Harter) - 2011-06-25 18:18 +0000
                Re: offset 1 list indexing Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-25 15:56 -0400
                Re: offset 1 list indexing James Kuyper <jameskuyper@verizon.net> - 2011-06-25 17:42 -0400
                Re: offset 1 list indexing cri@tiac.net (Richard Harter) - 2011-06-26 04:15 +0000
                Re: offset 1 list indexing pete <pfiland@mindspring.com> - 2011-06-26 01:51 -0400
                Re: offset 1 list indexing cri@tiac.net (Richard Harter) - 2011-06-26 15:48 +0000
                Re: offset 1 list indexing pete <pfiland@mindspring.com> - 2011-06-27 00:30 -0400
                Re: offset 1 list indexing Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-06-28 21:26 +0300
                Re: offset 1 list indexing pete <pfiland@mindspring.com> - 2011-06-28 23:36 -0400
                Re: offset 1 list indexing cri@tiac.net (Richard Harter) - 2011-06-29 15:28 +0000
                Re: offset 1 list indexing pete <pfiland@mindspring.com> - 2011-06-30 15:02 -0400
                Re: offset 1 list indexing Ike Naar <ike@sverige.freeshell.org> - 2011-06-26 07:00 +0000
                Re: offset 1 list indexing cri@tiac.net (Richard Harter) - 2011-06-26 15:20 +0000
                Re: offset 1 list indexing cri@tiac.net (Richard Harter) - 2011-06-26 03:41 +0000
                Re: offset 1 list indexing Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-26 08:51 -0400
                Re: offset 1 list indexing cri@tiac.net (Richard Harter) - 2011-06-26 15:32 +0000
                Re: offset 1 list indexing Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-26 11:48 -0400
                Re: offset 1 list indexing cri@tiac.net (Richard Harter) - 2011-06-26 16:43 +0000
                Re: offset 1 list indexing Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-06-28 21:30 +0300
                Re: offset 1 list indexing Karl Malbrain <malbrain@yahoo.com> - 2011-06-28 14:13 -0700
                Re: offset 1 list indexing Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-06-28 21:14 +0300
                Re: offset 1 list indexing Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-29 01:14 -0700
  Re: offset 1 list indexing Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-15 07:21 -0400
  Re: offset 1 list indexing Shao Miller <sha0.miller@gmail.com> - 2011-06-15 10:09 -0400
    Re: offset 1 list indexing Michael Press <rubrum@pacbell.net> - 2011-06-15 15:38 -0700
  Re: offset 1 list indexing China Blue Dolls <chine.bleu@yahoo.com> - 2011-06-25 21:04 -0700
    Re: offset 1 list indexing Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-26 09:01 -0400
    Re: offset 1 list indexing Michael Press <rubrum@pacbell.net> - 2011-06-26 13:15 -0700

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