Bug #62170 [NEW]: Inaccurate division

From: Date: Sun, 27 May 2012 05:01:08 +0000
Subject: Bug #62170 [NEW]: Inaccurate division
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-170854@lists.php.net to get a copy of this message 
From:             cidahf at live dot co dot uk
Operating system: Ubuntu 12.04
PHP version:      5.4.3
Package:          Math related
Bug Type:         Bug
Bug description:Inaccurate division

Description:
------------
When I divide 25.4 by 10000 I get an awkward 
0.002539999999999999723276911112179732299409806728363037109375 instead of
the 
desired 0.00254. I tried the same with Ruby 1.8.7 and it returned the
correct 
result.

This issue is problematic for unit conversion.

I also got this in 5.3 but I upgraded before making a report.

Test script:
---------------
echo 25.4 / 10000;

Expected result:
----------------
0.00254

Actual result:
--------------
0.002539999999999999723276911112179732299409806728363037109375

-- 
Edit bug report at https://bugs.php.net/bug.php?id=62170&edit=1
-- 
Try a snapshot (PHP 5.4):            https://bugs.php.net/fix.php?id=62170&r=trysnapshot54
Try a snapshot (PHP 5.3):            https://bugs.php.net/fix.php?id=62170&r=trysnapshot53
Try a snapshot (trunk):              https://bugs.php.net/fix.php?id=62170&r=trysnapshottrunk
Fixed in SVN:                        https://bugs.php.net/fix.php?id=62170&r=fixed
Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=62170&r=needdocs
Fixed in release:                    https://bugs.php.net/fix.php?id=62170&r=alreadyfixed
Need backtrace:                      https://bugs.php.net/fix.php?id=62170&r=needtrace
Need Reproduce Script:               https://bugs.php.net/fix.php?id=62170&r=needscript
Try newer version:                   https://bugs.php.net/fix.php?id=62170&r=oldversion
Not developer issue:                 https://bugs.php.net/fix.php?id=62170&r=support
Expected behavior:                   https://bugs.php.net/fix.php?id=62170&r=notwrong
Not enough info:                     https://bugs.php.net/fix.php?id=62170&r=notenoughinfo
Submitted twice:                     https://bugs.php.net/fix.php?id=62170&r=submittedtwice
register_globals:                    https://bugs.php.net/fix.php?id=62170&r=globals
PHP 4 support discontinued:          https://bugs.php.net/fix.php?id=62170&r=php4
Daylight Savings:                    https://bugs.php.net/fix.php?id=62170&r=dst
IIS Stability:                       https://bugs.php.net/fix.php?id=62170&r=isapi
Install GNU Sed:                     https://bugs.php.net/fix.php?id=62170&r=gnused
Floating point limitations:          https://bugs.php.net/fix.php?id=62170&r=float
No Zend Extensions:                  https://bugs.php.net/fix.php?id=62170&r=nozend
MySQL Configuration Error:           https://bugs.php.net/fix.php?id=62170&r=mysqlcfg

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