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Date: Thu, 27 Sep 2007 11:29:39 -0400 (EDT)
From: William Sutton <william AT trilug DOT org>
To: Andrew Louie <louiea AT gmail DOT com>
cc: cygwin AT cygwin DOT com
Subject: Re: strange behavior with perl v 5.8.8
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Nope, not a Cygwin specific issue.

I get the same behavior at the same point on Gentoo perl 5.8.8 (x86 
dual-Xeon), Debian Etch perl 5.8.8 (x86 P4), and SunOS 5.10 perl 5.8.4.

William Sutton


On Thu, 27 Sep 2007, Andrew Louie wrote:

> Hello,
>
> I've run into a strange adding problem with perl:
>
> when incrementing by 0.1 i get a strange behavior where at some
> arbitrary  number, it will append 0.9999999999 to the end of the
> number.
>
> test case:
> ------------------------------------------------------------------------------------
> my $start = 0;
> my $interval = 0.1;
> my $end = 10;
>
> do{ print "start: $start\n"; $start += $interval;}until($start >= $end);
> ------------------------------------------------------------------------------------
> Results:
> ...
> start: 4.5
> start: 4.6
> start: 4.7
> start: 4.8
> start: 4.9
> start: 5
> start: 5.1
> start: 5.2
> start: 5.3
> start: 5.4
> start: 5.5
> start: 5.6
> start: 5.7
> start: 5.8
> start: 5.9
> start: 5.99999999999999
> start: 6.09999999999999
> start: 6.19999999999999
> start: 6.29999999999999
> start: 6.39999999999999
> start: 6.49999999999999
> start: 6.59999999999999
> start: 6.69999999999999
> start: 6.79999999999999
> start: 6.89999999999999
> ------------------------------------------------------------------------------------
>
> why all of suddun i get 5.999999999?
>
> Is this a perl problem?
>
> im using cygwin version 1.5.24
> perl -v:
>
> This is perl, v5.8.8 built for cygwin-thread-multi-64int
> (with 8 registered patches, see perl -V for more detail)
>
>
> --
> -Andrew Louie
>
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