#48462 [NEW]: sprintf error when multiplying float and displaying digit

From: courtois at nouvo dot com Operating system: XP PHP version: 5.2.9 PHP Bug Type: Strings related Bug description: sprintf error when multiplying float and displaying digit Description: ------------ This a followup to bug #48455 which has been closed. I observed same bug with different values. I'm affraid rasmus' answer is incorrect. 3498 is represented with 12 bits. A float holds 24 bits which is far enough to contain 3498 without any single bit of precision loss. Anyway, the same program in C works fine: #include <stdio.h> main() { float f; f=34.98*100; printf("%6d %f\n",(int)f,f); } thus the problem is NOT with the float representation. Moreover the following script should return twice the same thing: $x=34.98*100; print "x:".$x." sprintf:".sprintf('%d',$x); but the unexpected result is: x:3498 sprintf:3497 If the first conversion from float to string works fine, why doesn't the second conversion work ? -- Edit bug report at http://bugs.php.net/?id=48462&edit=1 -- Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=48462&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=48462&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=48462&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=48462&r=fixedcvs Fixed in CVS and need be documented: http://bugs.php.net/fix.php?id=48462&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=48462&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=48462&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=48462&r=needscript Try newer version: http://bugs.php.net/fix.php?id=48462&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=48462&r=support Expected behavior: http://bugs.php.net/fix.php?id=48462&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=48462&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=48462&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=48462&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=48462&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=48462&r=dst IIS Stability: http://bugs.php.net/fix.php?id=48462&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=48462&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=48462&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=48462&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=48462&r=mysqlcfg