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[Bug libc/4943] Inconsistent rounding behaviour for sprintf and IEEE doubles
- From: "paul at inet dot co dot za" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 23 Sep 2007 10:20:48 -0000
- Subject: [Bug libc/4943] Inconsistent rounding behaviour for sprintf and IEEE doubles
- References: <20070820142205.4943.paul@inet.co.za>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From paul at inet dot co dot za 2007-09-23 10:20 -------
(In reply to comment #28)
> (In reply to comment #27)
> > Sorry, Vincent, but I do not agree with that bit of blurb. The actual value
> > when written in decimal cannot take more than 15 decimal digits into
> > consideration. The correct way to interpret the value is
> > 5000.524999999999636 == 5000.52499999999
> > with a possible error of
> > 0.000000000009636
>
> This is ridiculous and shows that you still haven't understood anything.
... and your comment shows that you have a very biased and narrow perspective.
>
> > For now, it seems that a pocket calculator does a better job of converting
> > binary floating point to decimal text representation than either GLibC,
> > MSVCRT.DLL or Vincent Lefèvre .
>
> FYI, most pocket calculators use decimal arithmetic, thus do not do any binary
> <-> decimal conversion. But now, I hope that you understand at least that you
> need decimal arithmetic.
I have stated repeatedly, that FP arithmetic is just fine for me. Why do you
insist that I need to use an arb precision library? I do not need more than 15
(In fact I need no more than 10) significant decimal digits in my calculations,
which IEEE double supposedly provides.
My problem is not with the binary representation of the number; it is with the
apparently incompetent conversion of those numbers to ascii text representation
inside a buffer for display.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=4943
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