Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c > #21417

Re: Open letter to Ian Collins

Show key headers only | View raw

Keith Thompson wrote:
> 
> Ian Collins <ian-news@hotmail.com> writes:
> > On 05/27/12 09:12 PM, jacob navia wrote:
> [...]
> >> With the generic qsort function you would directly compare
> >> the data (without function calls) by specifying a macro
> >> for comparing your data. For integers it would be simply
> >>
> >> a - b
> >
> > That will be interesting to see.
> 
> Especially for values like a==INT_MIN, b==INT_MAX.

I think there's about a zillion combinations of (a) and (b), 
where (a - b) has problems.

If (b) is negative, 
then (a - b) will be undefined whenever (a > b + INT_MAX).

If (b) is positive
then (a - b) will be undefined whenever (a < b + INT_MIN).

-- 
pete

Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Open letter to Ian Collins jacob navia <jacob@spamsink.net> - 2012-05-27 00:22 +0200
  Re: Open letter to Ian Collins Ike Naar <ike@sverige.freeshell.org> - 2012-05-26 22:36 +0000
    Re: Open letter to Ian Collins jacob navia <jacob@spamsink.net> - 2012-05-27 01:13 +0200
      Re: Open letter to Ian Collins Barry Schwarz <schwarzb@dqel.com> - 2012-05-26 16:53 -0700
    Re: Open letter to Ian Collins Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-05-26 16:41 -0700
      Re: Open letter to Ian Collins pete <pfiland@mindspring.com> - 2012-05-26 22:43 -0400
  Re: Open letter to Ian Collins Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-05-26 15:41 -0700
    Re: Open letter to Ian Collins jacob navia <jacob@spamsink.net> - 2012-05-27 01:14 +0200
  Re: Open letter to Ian Collins MelissA <melis@a.com> - 2012-05-27 00:52 +0200
  Re: Open letter to Ian Collins Stephen Sprunk <stephen@sprunk.org> - 2012-05-26 20:40 -0500
    Re: Open letter to Ian Collins jacob navia <jacob@spamsink.net> - 2012-05-27 09:32 +0200
      Re: Open letter to Ian Collins pete <pfiland@mindspring.com> - 2012-05-27 07:18 -0400
  Re: Open letter to Ian Collins Ian Collins <ian-news@hotmail.com> - 2012-05-27 14:24 +1200
    Re: Open letter to Ian Collins "BartC" <bc@freeuk.com> - 2012-05-27 10:36 +0100
      Re: Open letter to Ian Collins Ian Collins <ian-news@hotmail.com> - 2012-05-27 22:33 +1200
        Re: Open letter to Ian Collins "BartC" <bc@freeuk.com> - 2012-05-27 12:25 +0100
          Re: Open letter to Ian Collins Ian Collins <ian-news@hotmail.com> - 2012-05-28 07:17 +1200
      Re: Open letter to Ian Collins Ike Naar <ike@sverige.freeshell.org> - 2012-05-27 13:03 +0000
  Re: Open letter to Ian Collins Ian Collins <ian-news@hotmail.com> - 2012-05-27 15:16 +1200
    Re: Open letter to Ian Collins jacob navia <jacob@spamsink.net> - 2012-05-27 09:30 +0200
      Re: Open letter to Ian Collins Ian Collins <ian-news@hotmail.com> - 2012-05-27 20:56 +1200
        Re: Open letter to Ian Collins jacob navia <jacob@spamsink.net> - 2012-05-27 11:12 +0200
          Re: Open letter to Ian Collins Ian Collins <ian-news@hotmail.com> - 2012-05-27 21:22 +1200
            Re: Open letter to Ian Collins pete <pfiland@mindspring.com> - 2012-05-27 07:15 -0400
            Re: Open letter to Ian Collins Keith Thompson <kst-u@mib.org> - 2012-05-27 07:49 -0700
              Re: Open letter to Ian Collins pete <pfiland@mindspring.com> - 2012-05-27 13:55 -0400
                Re: Open letter to Ian Collins jacob navia <jacob@spamsink.net> - 2012-05-27 22:24 +0200
                Re: Open letter to Ian Collins "BartC" <bc@freeuk.com> - 2012-05-27 22:09 +0100
                Re: Open letter to Ian Collins Keith Thompson <kst-u@mib.org> - 2012-05-27 14:33 -0700
                Re: Open letter to Ian Collins pete <pfiland@mindspring.com> - 2012-05-27 17:49 -0400
                Re: Open letter to Ian Collins pete <pfiland@mindspring.com> - 2012-05-27 17:31 -0400
                Re: Open letter to Ian Collins Philip Lantz <prl@canterey.us> - 2012-05-28 01:38 -0700
                Re: Open letter to Ian Collins pete <pfiland@mindspring.com> - 2012-05-28 08:18 -0400
        Re: Open letter to Ian Collins "BartC" <bc@freeuk.com> - 2012-05-27 15:46 +0100
        Open letter to Ian Collins pete <pfiland@mindspring.com> - 2012-06-13 21:25 -0400
          Re: Open letter to Ian Collins pete <pfiland@mindspring.com> - 2012-06-13 21:52 -0400
          Re: Open letter to Ian Collins jacob navia <jacob@spamsink.net> - 2012-06-14 04:00 +0200
            Re: Open letter to Ian Collins pete <pfiland@mindspring.com> - 2012-06-14 00:04 -0400
  Re: Open letter to Ian Collins jacob navia <jacob@spamsink.net> - 2012-05-27 09:42 +0200
  Re: Open letter to Ian Collins "io_x" <a@b.c.invalid> - 2012-05-28 12:39 +0200
    Re: Open letter to Ian Collins "io_x" <a@b.c.invalid> - 2012-05-28 21:44 +0200
      Re: Open letter to Ian Collins jacob navia <jacob@spamsink.net> - 2012-05-29 09:46 +0200
        Re: Open letter to Ian Collins "io_x" <a@b.c.invalid> - 2012-05-29 10:06 +0200
          Re: Open letter to Ian Collins "io_x" <a@b.c.invalid> - 2012-05-29 10:37 +0200
            Re: Open letter to Ian Collins "io_x" <a@b.c.invalid> - 2012-05-29 10:58 +0200
              Re: Open letter to Ian Collins "Joachim Schmitz" <nospam.jojo@schmitz-digital.de> - 2012-05-29 11:34 +0200
              Re: Open letter to Ian Collins Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-05-29 03:02 -0700
      Re: Open letter to Ian Collins "io_x" <a@b.c.invalid> - 2012-05-29 09:59 +0200
      Re: Open letter to Ian Collins "io_x" <a@b.c.invalid> - 2012-05-29 20:09 +0200
  Re: Open letter to Ian Collins "Sarah Wren" <swreb@ameritech.net> - 2012-05-29 01:40 -0600

csiph-web