#46879 [NEW]: Float addition not always precise

From: php at thwien dot de Operating system: Linux-Debian 4.0 PHP version: 5.2CVS-2008-12-16 (snap) PHP Bug Type: Variables related Bug description: Float addition not always precise Description: ------------ Float comparison after addition isn't precise always. Reproduce code: --------------- $floatTotal = 19.99 + 39.99; print ($floatTotal - 59.98); Expected result: ---------------- 0 Actual result: -------------- 7.105427357601E-15 -- Edit bug report at http://bugs.php.net/?id=46879&edit=1 -- Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=46879&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=46879&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=46879&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=46879&r=fixedcvs Fixed in CVS and need be documented: http://bugs.php.net/fix.php?id=46879&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=46879&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=46879&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=46879&r=needscript Try newer version: http://bugs.php.net/fix.php?id=46879&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=46879&r=support Expected behavior: http://bugs.php.net/fix.php?id=46879&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=46879&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=46879&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=46879&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=46879&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=46879&r=dst IIS Stability: http://bugs.php.net/fix.php?id=46879&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=46879&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=46879&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=46879&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=46879&r=mysqlcfg