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Postings from July 2010
On Thu, Jul 29, 2010 at 08:18:11PM +0200, Bo Lindbergh wrote:
> (Ben Morrow) wrote:
> > Quoth jand@activestate.com ("Jan Dubois"):
> > > On Wed, 28 Jul 2010, Zefram wrote:
> > > > Jan Dubois wrote:
> > > > >Well, you _could_ add a special case to the string comparison:
> > > >
> > > > That would be a mess. The better solution is for negative zero to
> > > > stringify as "0".
> >
> > But that makes number->string->number round-tripping unreliable, which
> > was the whole reason for stringifying as "-0" in the first place. Lots
> > of code assumes that stringification preserves information.
>
> Except that "-0" doesn't numify to negative zero.
> "-0.0" and "-0." do (on darwin-ppc, at least).
>
> {
> print "'$_'\t=> ",$_/1,"\n" foreach qw( -0.0 -0. -0 );
> }
>
>
It does for me (linux-i686).
$ perl
print "'$_'\t=> ",$_/1,"\n" foreach qw( -0.0 -0. -0 );
^D
'-0.0' => -0
'-0.' => -0
'-0' => -0
$
Abigail
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