#27064 [NEW]: The mod function of % does not return the same results of fmod.

From: Date: Tue, 27 Jan 2004 20:35:06 +0000
Subject: #27064 [NEW]: The mod function of % does not return the same results of fmod.
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-53985@lists.php.net to get a copy of this message 
From:             ngaugler at ngworld dot net
Operating system: FreeBSD 4.9 / Linux 2.4.23
PHP version:      4.3.4
PHP Bug Type:     Math related
Bug description:  The mod function of % does not return the same results of fmod.

Description:
------------
When performing a % (mod) function on two numbers, PHP returns negative
values when it should not.  Example:

PHP:
(2190988683 % 3) returns -1
fmod(2190988683,3) returns 0

Perl:
(2190988683 % 3) returns 0

Reproduce code:
---------------
<?
echo "(2190988683 % 3) = " . (2190988683 % 3). "<br>\n";
echo "fmod(2190988683,3) = " . fmod(2190988683,3) . "<br>\n";
?>

Expected result:
----------------
(2190988683 % 3) = 0
fmod(2190988683,3) = 0

Actual result:
--------------
(2190988683 % 3) = -1
fmod(2190988683,3) = 0

-- 
Edit bug report at http://bugs.php.net/?id=27064&edit=1
-- 
Try a CVS snapshot (php4):  http://bugs.php.net/fix.php?id=27064&r=trysnapshot4
Try a CVS snapshot (php5):  http://bugs.php.net/fix.php?id=27064&r=trysnapshot5
Fixed in CVS:               http://bugs.php.net/fix.php?id=27064&r=fixedcvs
Fixed in release:           http://bugs.php.net/fix.php?id=27064&r=alreadyfixed
Need backtrace:             http://bugs.php.net/fix.php?id=27064&r=needtrace
Need Reproduce Script:      http://bugs.php.net/fix.php?id=27064&r=needscript
Try newer version:          http://bugs.php.net/fix.php?id=27064&r=oldversion
Not developer issue:        http://bugs.php.net/fix.php?id=27064&r=support
Expected behavior:          http://bugs.php.net/fix.php?id=27064&r=notwrong
Not enough info:            http://bugs.php.net/fix.php?id=27064&r=notenoughinfo
Submitted twice:            http://bugs.php.net/fix.php?id=27064&r=submittedtwice
register_globals:           http://bugs.php.net/fix.php?id=27064&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=27064&r=php3
Daylight Savings:           http://bugs.php.net/fix.php?id=27064&r=dst
IIS Stability:              http://bugs.php.net/fix.php?id=27064&r=isapi
Install GNU Sed:            http://bugs.php.net/fix.php?id=27064&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=27064&r=float

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