#26526 [NEW]: Unexpected behavior with ceil()

From: vince at blue-box dot net Operating system: FreeBSD 4.8-RELEASE-p13 PHP version: 4CVS-2003-12-04 (stable) PHP Bug Type: Math related Bug description: Unexpected behavior with ceil() Description: ------------ When using certain integers derived from multiplying integers and floating point numbers with ceil(), ceil() will increment the number even though it shouldn't be. Reproduce code: --------------- <?php $value = 6*.029*1000; echo "value = $value\n"; $value = ceil($value); echo "value = $value\n"; ?> Expected result: ---------------- Since 6*.029*1000 comes out to be exactly 174, I would expect the output of the above script to be: value = 174 value = 174 Actual result: -------------- value = 174 value = 175 It seems like if this were a floating point precision problem the first echo statement in the code example would produce something like: value = 174.000000000000000000001 -- Edit bug report at http://bugs.php.net/?id=26526&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=26526&r=trysnapshot4 Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=26526&r=trysnapshot5 Fixed in CVS: http://bugs.php.net/fix.php?id=26526&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=26526&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=26526&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=26526&r=needscript Try newer version: http://bugs.php.net/fix.php?id=26526&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=26526&r=support Expected behavior: http://bugs.php.net/fix.php?id=26526&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=26526&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=26526&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=26526&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=26526&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=26526&r=dst IIS Stability: http://bugs.php.net/fix.php?id=26526&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=26526&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=26526&r=float