Re: why do some writers declare and define variables separately

From	Ian Collins <ian-news@hotmail.com>
Newsgroups	comp.lang.c
Subject	Re: why do some writers declare and define variables separately
Date	2013-09-26 09:50 +1200
Message-ID	<bah45lFkslhU5@mid.individual.net> (permalink)
References	(3 earlier) <l1ulhq$2lp$1@dont-email.me> <bagu1qFkslhU3@mid.individual.net> <524349BA.1090100@verizon.net> <bah27qFkslhU4@mid.individual.net> <ce67d248-8e5f-4b67-bcdc-f56c5214d158@googlegroups.com>

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Öö Tiib wrote:
> On Thursday, 26 September 2013 00:17:46 UTC+3, Ian Collins  wrote:
>> James Kuyper wrote:

>>> However, not "having thought much" about a variable is not the same as
>>> "not knowing how it would be used". In general, the very first thought I
>>> have about a variable is "how it would be used". How it should be
>>> initialized is often a much later thought.
>>
>> At the point of first use.
>>
>> That way you always know how it is going to be used and what the correct
>> initial value is.  No uninitialised variables to worry or warn about.
>> Well, OK, there are output parameter values which don't have a "correct"
>> initialisation value.  These leave you with a choice of a compiler
>> warning or a dummy initial value.
>
> It depends how deeply people think before they type in some code.
> Prevailing approach to programming seems to be to consider code
> that passes some tests already "better than nothing" but also it may
> be is still "not thought much about" like "how it should work when
> that parameter is negative?". Warning about uninitialized variable can
> help to draw attention to such case earlier. Dummy may also work but
> give wrong results that will be discovered later.

Did you actually read what I wrote?  The only uninitialised variables I 
mentioned were those used as output function parameters.

-- 
Ian Collins

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why do some writers declare and define variables separately yoodavid <odimegwudavid@yahoo.fr> - 2013-09-18 16:42 -0500
  Re: why do some writers declare and define variables separately Fred K <fred.l.kleinschmidt@gmail.com> - 2013-09-18 14:52 -0700
  Re: why do some writers declare and define variables separately Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-09-18 18:08 -0400
  Re: why do some writers declare and define variables separately T0xicCode <T0xic@co.de> - 2013-09-18 18:10 -0400
    Re: why do some writers declare and define variables separately Ken Brody <kenbrody@spamcop.net> - 2013-09-19 11:16 -0400
      Re: why do some writers declare and define variables separately T0xicCode <T0xic@co.de> - 2013-09-19 11:45 -0400
  Re: why do some writers declare and define variables separately Keith Thompson <kst-u@mib.org> - 2013-09-18 15:45 -0700
  Re: why do some writers declare and define variables separately Jens Schmidt <Jens.Schmidt-HH@gmx.de> - 2013-09-19 01:19 +0200
  Re: why do some writers declare and define variables separately Francis Glassborow <francis.glassborow@btinternet.com> - 2013-09-19 02:13 +0100
    Re: why do some writers declare and define variables separately Ben Bacarisse <ben.usenet@bsb.me.uk> - 2013-09-19 03:59 +0100
      Re: why do some writers declare and define variables separately Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2013-09-27 00:49 +0300
      Re: why do some writers declare and define variables separately Anand Hariharan <mailto.anand.hariharan@gmail.com> - 2013-10-03 15:41 -0700
        Re: why do some writers declare and define variables separately Ben Bacarisse <ben.usenet@bsb.me.uk> - 2013-10-04 00:42 +0100
    Re: why do some writers declare and define variables separately Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-09-19 00:01 -0400
      Re: why do some writers declare and define variables separately David Brown <david@westcontrol.removethisbit.com> - 2013-09-19 10:17 +0200
      Re: why do some writers declare and define variables separately "osmium" <r124c4u102@comcast.net> - 2013-09-19 06:44 -0500
      Re: why do some writers declare and define variables separately Les Cargill <lcargill99@comcast.com> - 2013-09-19 08:00 -0500
        Re: why do some writers declare and define variables separately Noob <root@127.0.0.1> - 2013-09-19 15:12 +0200
        Re: why do some writers declare and define variables separately Keith Thompson <kst-u@mib.org> - 2013-09-19 08:31 -0700
          Re: why do some writers declare and define variables separately Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-09-19 11:35 -0400
            Re: why do some writers declare and define variables separately Keith Thompson <kst-u@mib.org> - 2013-09-19 12:16 -0700
              Re: why do some writers declare and define variables separately Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-09-19 15:32 -0400
                Re: why do some writers declare and define variables separately Tim Rentsch <txr@alumni.caltech.edu> - 2013-09-22 12:36 -0700
        Re: why do some writers declare and define variables separately Tim Rentsch <txr@alumni.caltech.edu> - 2013-09-22 11:28 -0700
          Re: why do some writers declare and define variables separately Öö Tiib <ootiib@hot.ee> - 2013-09-23 03:26 -0700
            Re: why do some writers declare and define variables separately Tim Rentsch <txr@alumni.caltech.edu> - 2013-09-24 20:33 -0700
              Re: why do some writers declare and define variables separately Öö Tiib <ootiib@hot.ee> - 2013-09-25 04:37 -0700
              Re: why do some writers declare and define variables separately Keith Thompson <kst-u@mib.org> - 2013-09-25 08:24 -0700
                Re: why do some writers declare and define variables separately glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-09-25 19:08 +0000
          Re: why do some writers declare and define variables separately Les Cargill <lcargill99@comcast.com> - 2013-09-25 17:37 -0500
    Re: why do some writers declare and define variables separately Tim Rentsch <txr@alumni.caltech.edu> - 2013-09-22 11:34 -0700
  Re: why do some writers declare and define variables separately gordonb.t5wsh@burditt.org (Gordon Burditt) - 2013-09-25 05:29 -0500
    Re: why do some writers declare and define variables separately Ian Collins <ian-news@hotmail.com> - 2013-09-25 22:35 +1200
      Re: why do some writers declare and define variables separately David Brown <david@westcontrol.removethisbit.com> - 2013-09-25 13:02 +0200
      Re: why do some writers declare and define variables separately James Kuyper <jameskuyper@verizon.net> - 2013-09-25 08:39 -0400
        Re: why do some writers declare and define variables separately Keith Thompson <kst-u@mib.org> - 2013-09-25 08:23 -0700
        Re: why do some writers declare and define variables separately Ian Collins <ian-news@hotmail.com> - 2013-09-26 08:06 +1200
          Re: why do some writers declare and define variables separately James Kuyper <jameskuyper@verizon.net> - 2013-09-25 16:38 -0400
            Re: why do some writers declare and define variables separately Ian Collins <ian-news@hotmail.com> - 2013-09-26 09:17 +1200
              Re: why do some writers declare and define variables separately Öö Tiib <ootiib@hot.ee> - 2013-09-25 14:32 -0700
                Re: why do some writers declare and define variables separately Ian Collins <ian-news@hotmail.com> - 2013-09-26 09:50 +1200
              Re: why do some writers declare and define variables separately Ian Collins <ian-news@hotmail.com> - 2013-09-26 09:55 +1200
              Re: why do some writers declare and define variables separately James Kuyper <jameskuyper@verizon.net> - 2013-09-25 18:50 -0400
                Re: why do some writers declare and define variables separately Ian Collins <ian-news@hotmail.com> - 2013-09-26 11:17 +1200
                Re: why do some writers declare and define variables separately James Kuyper <jameskuyper@verizon.net> - 2013-09-25 21:26 -0400
                Re: why do some writers declare and define variables separately Ian Collins <ian-news@hotmail.com> - 2013-09-26 13:50 +1200
      Re: why do some writers declare and define variables separately Noob <root@127.0.0.1> - 2013-09-25 15:55 +0200
        Re: why do some writers declare and define variables separately James Kuyper <jameskuyper@verizon.net> - 2013-09-25 10:03 -0400
          Re: why do some writers declare and define variables separately Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2013-09-27 01:29 +0300
      Re: why do some writers declare and define variables separately Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2013-09-27 01:20 +0300
    Re: why do some writers declare and define variables separately David Brown <david@westcontrol.removethisbit.com> - 2013-09-25 13:05 +0200
      Re: why do some writers declare and define variables separately Ben Bacarisse <ben.usenet@bsb.me.uk> - 2013-09-25 23:01 +0100
        Re: why do some writers declare and define variables separately James Kuyper <jameskuyper@verizon.net> - 2013-09-25 18:56 -0400
          Re: why do some writers declare and define variables separately David Brown <david@westcontrol.removethisbit.com> - 2013-09-26 09:10 +0200
            Re: why do some writers declare and define variables separately James Kuyper <jameskuyper@verizon.net> - 2013-09-26 07:31 -0400
              Re: why do some writers declare and define variables separately David Brown <david@westcontrol.removethisbit.com> - 2013-09-26 13:58 +0200
                Re: why do some writers declare and define variables separately James Kuyper <jameskuyper@verizon.net> - 2013-09-26 09:12 -0400
  Re: why do some writers declare and define variables separately Michael Lenz <unrest@nullvector.org> - 2013-10-03 19:06 +0000
    Re: why do some writers declare and define variables separately James Kuyper <jameskuyper@verizon.net> - 2013-10-03 15:26 -0400
  Re: why do some writers declare and define variables separately Dag-Erling Smørgrav <des@des.no> - 2013-10-03 21:15 +0200

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