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Re: Shortened form of condition

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Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
> Alla _ <modelling.data@gmail.com> writes:
>
>> Thank you for your explanations. I am sorry but Ben and James suggested
>> the ones that are close to my interpretation, while Barry has a different one.
>> I don't have problems with reading bool values and their opposites, but I 
>> do have an issue with controlling expressions and the way bool values are used
>> in them.
>>
>> 1) Ben and James suggest (it is close to how I have read the condition of 
>> while loop), if I am not mistaken, that because end_of_text had been initially
>> set to false, i.e. to 0, then "while (!end_of_text)" means 
>> "while(end_of_text is true, i.e. equals 1)".
>
> I don't see how you think I said that!  It means exactly the opposite.
> All of these are the same in your example program (except for some of
> them being bad style):
>
>   while (!end_of_text) ...
>   while (!end_of_text == 1) ...
>   while (!end_of_text != 0) ...
>   while (end_of_text == 0) ...
>   while (end_of_text != 1) ...

That last one is equivalent to the others only because end_of_text never
takes on a value other than 0 or 1.  If end_of_text could have the value
2 or -1, for example, it would behave differently.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

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Shortened form of condition Alla _ <modelling.data@gmail.com> - 2015-11-09 06:23 -0800
  Re: Shortened form of condition Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-09 14:44 +0000
  Re: Shortened form of condition James Kuyper <jameskuyper@verizon.net> - 2015-11-09 10:17 -0500
  Re: Shortened form of condition Barry Schwarz <schwarzb@dqel.com> - 2015-11-09 09:20 -0800
  Re: Shortened form of condition Alla _ <modelling.data@gmail.com> - 2015-11-09 10:11 -0800
    Re: Shortened form of condition Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-09 10:35 -0800
      Re: Shortened form of condition Alla _ <modelling.data@gmail.com> - 2015-11-10 00:14 -0800
        Re: Shortened form of condition Barry Schwarz <schwarzb@dqel.com> - 2015-11-10 03:04 -0800
          Re: Shortened form of condition glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-10 21:42 +0000
        Re: Shortened form of condition Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-10 11:13 +0000
          Re: Shortened form of condition Alla _ <modelling.data@gmail.com> - 2015-11-10 07:58 -0800
            Re: Shortened form of condition Richard Heathfield <rjh@cpax.org.uk> - 2015-11-10 17:06 +0000
            Re: Shortened form of condition James Kuyper <jameskuyper@verizon.net> - 2015-11-10 12:11 -0500
              Re: Shortened form of condition James Kuyper <jameskuyper@verizon.net> - 2015-11-10 14:01 -0500
          Re: Shortened form of condition Keith Thompson <kst-u@mib.org> - 2015-11-10 08:30 -0800
            Re: Shortened form of condition Alla _ <modelling.data@gmail.com> - 2015-11-10 09:07 -0800
              Re: Shortened form of condition Keith Thompson <kst-u@mib.org> - 2015-11-10 09:29 -0800
                Re: Shortened form of condition Alla _ <modelling.data@gmail.com> - 2015-11-10 11:02 -0800
                Re: Shortened form of condition Keith Thompson <kst-u@mib.org> - 2015-11-10 11:33 -0800
                Re: Shortened form of condition Alla _ <modelling.data@gmail.com> - 2015-11-11 00:28 -0800
                Re: Shortened form of condition Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-11 16:05 +0000
                Re: Shortened form of condition glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-12 09:29 +0000
                Re: Shortened form of condition Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-12 10:56 +0000
                Re: Shortened form of condition Richard Heathfield <rjh@cpax.org.uk> - 2015-11-11 16:24 +0000
                Re: Shortened form of condition Keith Thompson <kst-u@mib.org> - 2015-11-11 08:53 -0800
                Re: Shortened form of condition Richard Heathfield <rjh@cpax.org.uk> - 2015-11-11 16:59 +0000
                Re: Shortened form of condition Alla _ <modelling.data@gmail.com> - 2015-11-11 06:42 -0800
                Re: Shortened form of condition Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-10 14:04 -0500
              Re: Shortened form of condition Barry Schwarz <schwarzb@dqel.com> - 2015-11-10 10:43 -0800
    Re: Shortened form of condition James Kuyper <jameskuyper@verizon.net> - 2015-11-09 13:44 -0500
    Re: Shortened form of condition Keith Thompson <kst-u@mib.org> - 2015-11-09 10:57 -0800
      Re: Shortened form of condition Philip Lantz <prl@canterey.us> - 2015-11-10 01:52 -0800
    Re: Shortened form of condition Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-09 19:35 +0000
      Re: Shortened form of condition Keith Thompson <kst-u@mib.org> - 2015-11-09 11:52 -0800
  Re: Shortened form of condition Alla _ <modelling.data@gmail.com> - 2015-11-10 00:33 -0800
    Re: Shortened condition Richard Heathfield <rjh@cpax.org.uk> - 2015-11-10 09:00 +0000
  Re: Shortened form of condition Tim Rentsch <txr@alumni.caltech.edu> - 2015-11-10 16:01 -0800

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