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From:	"Dave Korn" <dave DOT korn AT artimi DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	RE: SV: Bug in printf ?
Date:	Thu, 30 Jun 2005 13:29:56 +0100
MIME-Version:	1.0
In-Reply-To:	<6879888.1120133556579.JavaMail.adm-moff@moffice2.nsc.no>
Message-ID:	<SERRANO8kxpycYGQ74C000002d5@SERRANO.CAM.ARTIMI.COM>

----Original Message----
>From: Peter J. Acklam
>Sent: 30 June 2005 13:13

> Dave Korn [dave DOT korn AT NONONOATHOUSANDTIMESNO] wrote:
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  http://cygwin.com/acronyms#PCYMTNQREAIYR please!  TIA!

> 
>> haro AT OOPSNOTAGAIN wrote:
>> 
>>> How come "0.125" gets printed as "0.12", and not "1.3"?
>> 
>> Absolutely, there's a rounding error of some sort.
> 
> For what it's worth: My Sunblade 100 running Solaris 9 has
> Solaris' /bin/printf and GNU's printf as /usr/local/bin/printf
> and both give "0.12", not "0.13".
> 
> I am quite sure it is the printf returning "0.13" that is buggy.

  Have you considered that your sunblade might be operating in a different
rounding mode, by default?

> Note that the value "0.125" can be represented exactly with IEEE
> double precision arithmetic, so inexact representation is not the
> matter here.

  I never suggested it was.  Nonetheless, I would imagine that printf may
well work under-the-hood by shifting the desired decimal places above the
point, rounding to integer, and printing out that number.

    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


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