#35986 [NEW]: Rounding error
| From: | nathan at pngwyn dot com | Date: | Thu, 12 Jan 2006 21:37:49 +0000 |
| Subject: | #35986 [NEW]: Rounding error | ||
| Groups: | php.bugs | ||
| Request: | Send a blank email to php-bugs+get-91813@lists.php.net to get a copy of this message | ||
From: nathan at pngwyn dot com
Operating system: Linux
PHP version: 5.1.2
PHP Bug Type: *Math Functions
Bug description: Rounding error
Description:
------------
Rounding error on all numbers between 2048 and 8191 ending with .575 -
When rounding to two decimal places.
For Example, instead of rounding 2048.575 up to 2048.58 it is rounding
down to 2048.57
See attached Code.
Example URL: http://www.pngwyn.com/test.php
* Note: Example URL is running 5.05 - But this has been tested on 5.1.2 as
well.
Reproduce code:
---------------
<?php
$start = 2040.575;
$for = '6500';
$max = $for + $start;
print("<font face=verdana size=2><a
href=\"http://www.pngwyn.com/phpinfo.php\">PHP
Info for this
Server</a><br><br>");
for($i = $start; $i <= $max; $i++) {
$round = round($i, 2);
print("Original Number: <b>$i</b> --- Rounded Number:
<b>$round</b> <br>");
}
?>
Expected result:
----------------
Original Number: 2046.575 --- Rounded Number: 2046.58
Original Number: 2047.575 --- Rounded Number: 2047.58
Original Number: 2048.575 --- Rounded Number: 2048.58
Original Number: 2049.575 --- Rounded Number: 2049.58
[ 2050.575 - 8189.575 ... ]
Original Number: 8190.575 --- Rounded Number: 8190.58
Original Number: 8191.575 --- Rounded Number: 8191.58
Original Number: 8192.575 --- Rounded Number: 8192.58
Original Number: 8193.575 --- Rounded Number: 8193.58
Actual result:
--------------
Original Number: 2046.575 --- Rounded Number: 2046.58
Original Number: 2047.575 --- Rounded Number: 2047.58
Original Number: 2048.575 --- Rounded Number: 2048.57
Original Number: 2049.575 --- Rounded Number: 2049.57
[ 2050.575 - 8189.575 ... ]
Original Number: 8190.575 --- Rounded Number: 8190.57
Original Number: 8191.575 --- Rounded Number: 8191.57
Original Number: 8192.575 --- Rounded Number: 8192.58
Original Number: 8193.575 --- Rounded Number: 8193.58
--
Edit bug report at http://bugs.php.net/?id=35986&edit=1
--
Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=35986&r=trysnapshot44
Try a CVS snapshot (PHP 5.1): http://bugs.php.net/fix.php?id=35986&r=trysnapshot51
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=35986&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=35986&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=35986&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=35986&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=35986&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=35986&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=35986&r=support
Expected behavior: http://bugs.php.net/fix.php?id=35986&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=35986&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=35986&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=35986&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=35986&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=35986&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=35986&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=35986&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=35986&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=35986&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=35986&r=mysqlcfg