Bug #61580 [NEW]: wrong calculation of Modulus operator

From: Operating system: CentOS PHP version: 5.3.10 Package: *Math Functions Bug Type: Bug Bug description:wrong calculation of Modulus operator Description: ------------ The operator % can not calculate the following calculation: Wrong calculation: echo (16.49*100)%100; // prints 48 (should be 49) Right calculations: echo (13.49*100)%100; // prints 49 echo (14.49*100)%100; // prints 49 echo (15.49*100)%100; // prints 49 Test script: --------------- echo "A wrong calculation:"; echo "<br>(16.49*100)%100 = ".((16.49*100)%100)." *By PHP"; echo "<br>(16.49*100)%100 = 1649%100 = 49 *By Hand"; echo "<br><br>A right calculation:"; echo "<br>(15.49*100)%100 = ".((15.49*100)%100)." *By PHP"; echo "<br>(15.49*100)%100 = 1549%100 = 49 *By Hand"; Expected result: ---------------- All results should be the same value (by hand == by PHP) -- Edit bug report at https://bugs.php.net/bug.php?id=61580&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=61580&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=61580&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=61580&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=61580&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=61580&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=61580&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=61580&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=61580&r=needscript Try newer version: https://bugs.php.net/fix.php?id=61580&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=61580&r=support Expected behavior: https://bugs.php.net/fix.php?id=61580&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=61580&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=61580&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=61580&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=61580&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=61580&r=dst IIS Stability: https://bugs.php.net/fix.php?id=61580&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=61580&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=61580&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=61580&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=61580&r=mysqlcfg