#42294 [Opn->Asn]: round will not use PHP_ROUND_FUZZ on 64bit CPUs

ID: 42294 Updated by: jani@php.net Reported By: oliver at teqneers dot de -Status: Open +Status: Assigned Bug Type: *Configuration Issues Operating System: OpenSuSE 10.2 PHP Version: 5.2.4RC1 -Assigned To: +Assigned To: iliaa New Comment: Assigned to Ilia who implemented that PHP_ROUND_FUZZ. Previous Comments: ------------------------------------------------------------------------ [2007-08-16 11:34:25] oliver at teqneers dot de you might use a windows machine? there the fuzzy seems to be always turned off (I don't know why though???). math.c: ------- #ifndef PHP_ROUND_FUZZ # ifndef PHP_WIN32 # define PHP_ROUND_FUZZ 0.50000000001 # else # define PHP_ROUND_FUZZ 0.5 # endif #endif But I have to admit, that I forgot to switch to the php5 versions on our 32bit server. So on all our PHP4 versions with 32bit, round seems to work as mathematically expected. Sorry for that. BUT still the result could be correct with PHP_ROUND_FUZZ on, like it did with PHP4. I compiled the latest PHP5 (5.2.4RC1) and changed the configure check to be more precise. After that the round was working much better, than it did before. My current result with the patched configure script is: 0.285 - 0.29 1.285 - 1.29 1.255 - 1.26 I mean, why is the FUZZ implemented and not used??? ------------------------------------------------------------------------ [2007-08-16 10:30:57] jani@php.net Output for me on a 32bit system: 0.285 - 0.28 1.285 - 1.29 1.255 - 1.25 ------------------------------------------------------------------------ [2007-08-16 10:29:52] jani@php.net Those results you get are NOT incorrect. If you round using 2 decimals, of course that's what you get. ------------------------------------------------------------------------ [2007-08-15 11:25:09] oliver at teqneers dot de this is an example of the comment block of the round documentation (http://de.php.net/manual/en/function.round.php): <?php printf("0.285 - %s <br> ",round(0.285,2)); // incorrect result 0.28 printf("1.285 - %s <br> ",round(1.285,2)); // correct result 1.29 printf("1.255 - %s <br><br>",round(1.255,2)); // incorrect result 1.25 ?> ------------------------------------------------------------------------ [2007-08-15 08:47:36] jani@php.net Can you please provide a short PHP code example which fails because of this..? ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/42294 -- Edit this bug report at http://bugs.php.net/?id=42294&edit=1