From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Helmut Eller <eller.helmut@gmail.com>
Cc: 5114@emacsbugs.donarmstrong.com
Subject: bug#5114: 23.1.50; (string-to-number (number-to-string most-positive-fixnum))
Date: Thu, 03 Dec 2009 15:52:16 -0500 [thread overview]
Message-ID: <jwvskbr6asf.fsf-monnier+emacsbugreports@gnu.org> (raw)
In-Reply-To: <m28wdkgm50.fsf@gmail.com> (Helmut Eller's message of "Thu, 03 Dec 2009 15:36:27 +0100")
> (setq x (string-to-number (number-to-string most-positive-fixnum)))
> (= most-positive-fixnum x) => nil
> x is 2305843009213693440 but it should be most-positive-fixnum
> which is 2305843009213693951.
> The test
> (= most-positive-fixnum
> (string-to-number (number-to-string most-positive-fixnum)))
> seems to work as expected on 32-bit machines but not so on 64 bit.
Indeed, it passes through a floating point conversion, so there's only
abour 52 bit of precesion.
Stefan
next prev parent reply other threads:[~2009-12-03 20:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-03 14:36 bug#5114: 23.1.50; (string-to-number (number-to-string most-positive-fixnum)) Helmut Eller
2009-12-03 20:52 ` Stefan Monnier [this message]
2009-12-05 12:36 ` Helmut Eller
2009-12-05 14:25 ` Eli Zaretskii
2009-12-05 15:18 ` Helmut Eller
2009-12-05 16:44 ` Eli Zaretskii
2011-09-18 9:47 ` Lars Magne Ingebrigtsen
2011-09-18 10:57 ` Leo
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