#44311 [NEW]: Bug in arithmetic operation: 173.42-173.42=2.8421709430404E-014

From: sawas at poczta dot onet dot pl Operating system: WinXP, Debian PHP version: 4.4.8 PHP Bug Type: Math related Bug description: Bug in arithmetic operation: 173.42-173.42=2.8421709430404E-014 Description: ------------ I found a bug in arithmetic operation. Simple subtraction of amounts gives inaccurate result. Reproduce code: --------------- $a = 160.00 + 5.90 + 7.52; $b = 173.42; print $a-$b; Expected result: ---------------- 0 Actual result: -------------- 2.8421709430404E-014 -- Edit bug report at http://bugs.php.net/?id=44311&edit=1 -- Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=44311&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=44311&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=44311&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=44311&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=44311&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=44311&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=44311&r=needscript Try newer version: http://bugs.php.net/fix.php?id=44311&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=44311&r=support Expected behavior: http://bugs.php.net/fix.php?id=44311&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=44311&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=44311&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=44311&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=44311&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=44311&r=dst IIS Stability: http://bugs.php.net/fix.php?id=44311&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=44311&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=44311&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=44311&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=44311&r=mysqlcfg