Bug #62959 [NEW]: Wrong math

From: lauris dot kuznecovs at laurisnet dot com Operating system: Windows 7, Centos 5.8 PHP version: 5.4.6 Package: Math related Bug Type: Bug Bug description:Wrong math Description: ------------ <? echo (443.292 - 193.126 - 250.166); ?> Return: -2.8421709430404e-14 <? echo round(443.292 - 193.126 - 250.166, 2); ?> Return: -0 But these calculations must return 0. BTW -0 does not exist in MATH. Maybe some error in rounding function. Test script: --------------- <? echo (443.292 - 193.126 - 250.166); ?> <? echo round(443.292 - 193.126 - 250.166, 2); ?> Expected result: ---------------- 0 -- Edit bug report at https://bugs.php.net/bug.php?id=62959&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=62959&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=62959&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=62959&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=62959&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=62959&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=62959&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=62959&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=62959&r=needscript Try newer version: https://bugs.php.net/fix.php?id=62959&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=62959&r=support Expected behavior: https://bugs.php.net/fix.php?id=62959&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=62959&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=62959&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=62959&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=62959&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=62959&r=dst IIS Stability: https://bugs.php.net/fix.php?id=62959&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=62959&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=62959&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=62959&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=62959&r=mysqlcfg