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Groups > comp.lang.c > #5797

Re: pointer = &membuff[-2];

From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: pointer = &membuff[-2];
Date 2011-06-10 08:12 -0700
Organization None to speak of
Message-ID <lnwrgtafg7.fsf@nuthaus.mib.org> (permalink)
References <isrcm7$q94$1@speranza.aioe.org> <ln8vtabj64.fsf@nuthaus.mib.org>

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Keith Thompson <kst-u@mib.org> writes:
[...]
> However, in your case the index expression is ``n1 - n2''.  Both n1 and
> n2 are of type unsigned int, with values 0 and 2, respectively -- which
> means that the result of the subtractin is *not* -2, but UINT_MAX-2
> (on your system, 4294967294U).
[...]

That's UINT_MAX-1, not UINT_MAX-2.

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

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Thread

pointer = &membuff[-2]; "Bo S." <bo@boo.invalid> - 2011-06-09 21:07 +0000
  Re: pointer = &membuff[-2]; Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-06-09 16:47 -0600
    Re: pointer = &membuff[-2]; BGB <cr88192@hotmail.com> - 2011-06-09 22:59 -0700
    Re: pointer = &membuff[-2]; pete <pfiland@mindspring.com> - 2011-06-10 06:28 -0400
  Re: pointer = &membuff[-2]; Keith Thompson <kst-u@mib.org> - 2011-06-09 17:54 -0700
    Re: pointer = &membuff[-2]; Noob <root@127.0.0.1> - 2011-06-10 13:03 +0200
      Re: pointer = &membuff[-2]; Keith Thompson <kst-u@mib.org> - 2011-06-10 08:10 -0700
    Re: pointer = &membuff[-2]; Keith Thompson <kst-u@mib.org> - 2011-06-10 08:12 -0700
  Re: pointer = &membuff[-2]; Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-09 21:02 -0400
  Re: pointer = &membuff[-2]; James Kuyper <jameskuyper@verizon.net> - 2011-06-09 22:25 -0400
  Re: pointer = &membuff[-2]; Shao Miller <sha0.miller@gmail.com> - 2011-06-10 01:10 -0500
    Re: pointer = &membuff[-2]; Shao Miller <sha0.miller@gmail.com> - 2011-06-10 01:13 -0500
      Re: pointer = &membuff[-2]; Shao Miller <sha0.miller@gmail.com> - 2011-06-10 01:20 -0500
  Re: pointer = &membuff[-2]; Shao Miller <sha0.miller@gmail.com> - 2011-06-10 03:33 -0500
  Re: pointer = &membuff[-2]; James Kuyper <jameskuyper@verizon.net> - 2011-06-10 08:23 -0400
  Re: pointer = &membuff[-2]; Sherm Pendley <sherm.pendley@gmail.com> - 2011-06-10 09:30 -0400
  Re: pointer = &membuff[-2]; ImpalerCore <jadill33@gmail.com> - 2011-06-10 07:15 -0700

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