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Re: comparing floating point numbers

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On 1/29/12 10:48 AM, Adam Majewski wrote:
> Hi,
>
> I have seen code that compers like that :
>
> if (b == 0.0 && (a == 0.25 || a == -0.75))
>
> so I have checked it :
>
> #include <iostream>
>
> using namespace std;
>
> int main() {
> cout << boolalpha
> << "The true expression 0.25 == 0.25000000000000001 yields : "
> << (0.25 == 0.25000000000000001) << endl
> << "The false expression 0.25 == 0.2500000000000001 yields: "
> << (0.25 == 0.2500000000000001) << endl;
> }
>
>
> Is it operator overloadin ? Is it good code ?
>
> TIA
>
> Adam


So what was the output from the code? I would think you might get 
different answers with different compilers.

-- 
Dave Scruggs

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Thread

comparing floating point numbers Adam Majewski <adammaj1@o2.pl> - 2012-01-29 19:48 +0100
  Re: comparing floating point numbers BCFD36 <bcfd36@cruzio.com> - 2012-01-29 11:02 -0800
    Re: comparing floating point numbers "MikeWhy" <boat042-nospam@yahoo.com> - 2012-01-29 13:25 -0600
      Re: comparing floating point numbers "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2012-01-29 20:40 +0100
    Re: comparing floating point numbers Adam Majewski <adammaj1@o2.pl> - 2012-01-30 18:03 +0100
  Re: comparing floating point numbers Marcel Müller <news.5.maazl@spamgourmet.com> - 2012-01-29 21:34 +0100
    Re: comparing floating point numbers BCFD36 <bcfd36@cruzio.com> - 2012-01-29 14:55 -0800
      Re: comparing floating point numbers Miles Bader <miles@gnu.org> - 2012-01-30 11:48 +0900
        Re: comparing floating point numbers Juha Nieminen <nospam@thanks.invalid> - 2012-01-30 14:53 +0000
    Re: comparing floating point numbers scott@slp53.sl.home (Scott Lurndal) - 2012-01-30 17:22 +0000
      Re: comparing floating point numbers Robert Wessel <robertwessel2@yahoo.com> - 2012-01-30 13:55 -0600
      Re: comparing floating point numbers glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-02-13 01:56 +0000
  Re: comparing floating point numbers LR <lruss@superlink.net> - 2012-01-29 18:30 -0500
    Re: comparing floating point numbers Thomas Boell <tboell@domain.invalid> - 2012-01-30 16:29 +0100
  Re: comparing floating point numbers Christian Gollwitzer <auriocus@gmx.de> - 2012-01-30 08:07 +0100
    Re: comparing floating point numbers glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-02-13 01:59 +0000
  Re: comparing floating point numbers Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-30 06:26 -0800

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