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List:       kde-devel
Subject:    Re: Open Bugs in 3.2
From:       Graeme Ambler <Graeme.Ambler () bristol ! ac ! uk>
Date:       2004-01-11 11:59:54
Message-ID: 200401111159.54131.Graeme.Ambler () bristol ! ac ! uk
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On Sunday 11 January 2004 11:27, Luciano Montanaro wrote:
> On Sunday 11 January 2004 10:48, Andreas Hartmann wrote:
> > Chris Howells wrote:
> > > On Sunday 11 January 2004 09:05, Andreas Hartmann wrote:
> > >>>71979. Do you want to ship a KDE, which incorporates a calculator
> > >>> (kcalc), which calculates wrong? I think, this is a fatal bug.
> > >>>
> > >>>
> > >>>49.84 + 33.52 = 83.36000000000001
> > >
> > > Can't reproduce on FreeBSD.  Broken libc?
> >
> > glibc 2.3.2 - kcalc in KDE 3.1.x works fine (with same glibc).
>
> It seems to be "fixed". The maximum number of significant digits is limited
> to 10 in the configuration panel, and I think it defaults to two - not that
> the original result is too wrong, it differs from the correct solution by
> 1^-14.
It doesn't even seem like a "bug" to me, simply a case of "ask a stupid 
question (what is 49.84+33.52 to 16 significant figures?), get a stupid 
answer (83.36000000000001)".  This is simply a feature of the limited 
precision of the floating point representation of the number.  Anyone who 
wants accuracy to 16 significant figures shouldn't be using a simple 
calculator program, and if they are they shouldn't expect to get reliable 
answers!

Graeme.
 
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