Bug #55843 [NEW]: float gives strange result when division is done prior.

From: Operating system: linux mandriva 2011 PHP version: Irrelevant Package: Scripting Engine problem Bug Type: Bug Bug description:float gives strange result when division is done prior. Description: ------------ float gives strange result when division is done prior. Test script: --------------- $tempout = 5037; $tempin = 5000; $tempdiff = $tempout - $tempin; $tempout = ($tempout / 100); $tempin = ($tempin / 100); $tempdiff = ($tempdiff / 100); $tempdiffActual = $tempout - $tempin; var_dump($tempdiffActual); echo "gives: float(0.37) <br>"; var_dump($tempdiff); echo "gives: float(0.37) <br>"; $something = $tempdiffActual - $tempdiff; var_dump($something); echo "gives: float(-2.5535129566379E-15). Should be 0 <br>"; Expected result: ---------------- var_dump($something); should be float(0) Actual result: -------------- var_dump($something); result: float(-2.5535129566379E-15) -- Edit bug report at https://bugs.php.net/bug.php?id=55843&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=55843&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=55843&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=55843&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=55843&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=55843&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=55843&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=55843&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=55843&r=needscript Try newer version: https://bugs.php.net/fix.php?id=55843&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=55843&r=support Expected behavior: https://bugs.php.net/fix.php?id=55843&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=55843&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=55843&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=55843&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=55843&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=55843&r=dst IIS Stability: https://bugs.php.net/fix.php?id=55843&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=55843&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=55843&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=55843&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=55843&r=mysqlcfg