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Re: File Manipulation?

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From Miles Bader <miles@gnu.org>
Newsgroups comp.lang.c++
Subject Re: File Manipulation?
Date Wed, 01 Jun 2011 15:07:30 +0900
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Jorgen Grahn <grahn+nntp@snipabacken.se> writes:
> - you can't reliably use != on doubles

Of course one shouldn't do so blindly, but there are certainly cases
where it makes sense to use != or == on doubles.

E.g., comparison of doubles holding integral values that result from an
explicit assignment should be fine (double d = 47; .... if (d != 47) ).
This is very useful for detecting explicitly assigned out-of-band (for
the algorithm) values.

[I guess some fractional values (e.g. 0.5) should in practice also be OK
since they're exactly representable in any sane radix (2, 10, 16).]

-Miles

-- 
Consult, v.i. To seek another's disapproval of a course already decided on.

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Thread

File Manipulation? A Moose in Love <parkstreetbooboo@gmail.com> - 2011-05-30 17:20 -0700
  Re: File Manipulation? Ian Collins <ian-news@hotmail.com> - 2011-05-31 12:24 +1200
  Re: File Manipulation? Öö Tiib <ootiib@hot.ee> - 2011-05-30 18:15 -0700
    Re: File Manipulation? A Moose in Love <parkstreetbooboo@gmail.com> - 2011-05-30 19:22 -0700
      Re: File Manipulation? Ian Collins <ian-news@hotmail.com> - 2011-05-31 14:33 +1200
        Re: File Manipulation? John Smith <bit_bucket@gmx.com> - 2011-05-30 19:57 -0700
        Re: File Manipulation? Liberian Freighter <parkstreetbooboo@gmail.com> - 2011-05-31 06:41 -0700
      Re: File Manipulation? Geoff <geoff@invalid.invalid> - 2011-05-30 19:59 -0700
      Re: File Manipulation? Geoff <geoff@invalid.invalid> - 2011-05-30 20:25 -0700
      Re: File Manipulation? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-05-31 22:33 +0000
        Re: File Manipulation? Miles Bader <miles@gnu.org> - 2011-06-01 15:07 +0900
  Re: File Manipulation? Juha Nieminen <nospam@thanks.invalid> - 2011-05-31 08:25 +0000
  Re: File Manipulation? "Fred Zwarts \(KVI\)" <F.Zwarts@KVI.nl> - 2011-05-31 16:25 +0200

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