Bug #46781 [ReO->Csd]: BC math handles minus zero incorrectly

Edit report at https://bugs.php.net/bug.php?id=46781&edit=1 ID: 46781 Updated by: cmb@php.net Reported by: preechaw at gmail dot com Summary: BC math handles minus zero incorrectly -Status: Re-Opened +Status: Closed Type: Bug Package: BC math related Operating System: Windows XP PHP Version: 5.2.7 Assigned To: cmb Block user comment: N Private report: N New Comment: Automatic comment on behalf of cmbecker69@gmx.de Revision: http://git.php.net/?p=php-src.git;a=commit;h=9aa6898b9be78bb1e138488c3204bb745a31aca7 Log: Fixed bug #46781 (BC math handles minus zero incorrectly) Previous Comments: ------------------------------------------------------------------------ [2017-09-11 15:16:29] cmb@php.net Indeed, that's still broken, see <https://3v4l.org/J93YJ>. ------------------------------------------------------------------------ [2011-04-16 21:00:37] testify4 at o2 dot pl jani@php.net, "expected result" that you got is obviously incorrect. I am using PHP 5.3.3 and this bug still exists. Please change the bug status. Thank you. Reproduce code: --------------- <?php bcscale(2); print bcadd('-0.0', '-0.0') . '<br>'; // prints: -0.00, should be: 0.00 print bccomp('-0.0', '0') . '<br>'; // prints: -1, should be: 0 ?> ------------------------------------------------------------------------ [2009-01-21 20:01:07] jani@php.net I get the expected result with current release. (5.2.8) ------------------------------------------------------------------------ [2008-12-06 12:39:40] preechaw at gmail dot com Description: ------------ bcadd("-0.0", "-0.0", 1); // returns -0.0 bccomp("-0.0", "0", 1); // returns -1 I believe that the first expression should return '0.0', and the second one should return 0. The second expression implies that "-0.0" is mathematically less than "0", which is incorrect. -- I also submitted another bug related to minus zero. echo -0.1 * 0; // returns -0 -- Reproduce code: --------------- <?php echo bcadd("-0.0", "-0.0", 1) . "<br>\n"; // returns -0.0 echo bccomp("-0.0", "0", 1) . "<br>\n"; // returns -1 ?> Expected result: ---------------- -0.0 -1 Actual result: -------------- 0.0 0 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=46781&edit=1