#27733 [NEW]: inaccurate arithmetic calculations

From: admin at rubas dot net Operating system: Linux 2.4.xx and 2.6.xx PHP version: 4.3.4 PHP Bug Type: Math related Bug description: inaccurate arithmetic calculations Description: ------------ Sample Code: <?php $resultA = ((6 * 5.95) - (5.95 + 5.95 + 5.95 + 5.95 + 5.95 + 5.95)); $resultB = ((7 * 5.95) - (5.95 + 5.95 + 5.95 + 5.95 + 5.95 + 5.95 + 5.95)); echo "Result A: ".$resultA."\n"; echo "Result B: ".$resultB."\n"; ?> Output: Result A: 0 Result B: -7.105427357601E-15 Reproduced with: PHP 4.3.4 PHP 4.3.3 PHP 4.3.2 Reproduce code: --------------- Sample Code: <?php $resultA = ((6 * 5.95) - (5.95 + 5.95 + 5.95 + 5.95 + 5.95 + 5.95)); $resultB = ((7 * 5.95) - (5.95 + 5.95 + 5.95 + 5.95 + 5.95 + 5.95 + 5.95)); echo "Result A: ".$resultA."\n"; echo "Result B: ".$resultB."\n"; ?> Expected result: ---------------- Result A: 0 Result B: 0 Actual result: -------------- Result A: 0 Result B: -7.105427357601E-15 -- Edit bug report at http://bugs.php.net/?id=27733&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=27733&r=trysnapshot4 Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=27733&r=trysnapshot5 Fixed in CVS: http://bugs.php.net/fix.php?id=27733&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=27733&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=27733&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=27733&r=needscript Try newer version: http://bugs.php.net/fix.php?id=27733&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=27733&r=support Expected behavior: http://bugs.php.net/fix.php?id=27733&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=27733&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=27733&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=27733&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=27733&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=27733&r=dst IIS Stability: http://bugs.php.net/fix.php?id=27733&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=27733&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=27733&r=float