Bug #66326 [NEW]: math oparation

From: ivo dot urbanek at yahoo dot co dot uk Operating system: Win 7 x64 / openSUSE 12.3 PHP version: 5.4.23 Package: *General Issues Bug Type: Bug Bug description:math oparation Description: ------------ Great problem with calculation power two - how easy, have a look B^2 = B*B but not in PHP. Please run a example. If B = 12E4, than B*B is not B^2 !!! Test script: --------------- $A=1; $B=6.911824E4; $C=3.95554E8; // $D = $B^2-4*$A*$C; $sqr=sqrt($D); echo "discriminant = $D <br>"; $D = $B*$B; echo "B*B = $D <br>"; $D = $B^2; echo "B^2 = $D <br>"; # <-- Here is deferent number !!! // $D = 4*$A*$C; echo "4*A*C = $D <br>"; Expected result: ---------------- B*B = 4777331100.6976 B^2 = 69116 # <-- Incorrect ! B*B = 4777331100.6976 # good answer Actual result: -------------- B^2 = 69116 # <-- Incorrect ! -- Edit bug report at https://bugs.php.net/bug.php?id=66326&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=66326&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=66326&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=66326&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=66326&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=66326&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=66326&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=66326&r=needscript Try newer version: https://bugs.php.net/fix.php?id=66326&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=66326&r=support Expected behavior: https://bugs.php.net/fix.php?id=66326&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=66326&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=66326&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=66326&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=66326&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=66326&r=dst IIS Stability: https://bugs.php.net/fix.php?id=66326&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=66326&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=66326&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=66326&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=66326&r=mysqlcfg