#38300 [Opn->Bgs]: equation result error

ID: 38300 Updated by: tony2001@php.net Reported By: rogergg at gmail dot com -Status: Open +Status: Bogus Bug Type: *Compile Issues Operating System: linux/windows PHP Version: 5.1.4 New Comment: Floating point values have a limited precision. Hence a value might not have the same string representation after any processing. That also includes writing a floating point value in your script and directly printing it without any mathematical operations. If you would like to know more about "floats" and what IEEE 754 is read this: http://docs.sun.com/source/806-3568/ncg_goldberg.html Thank you for your interest in PHP. Previous Comments: ------------------------------------------------------------------------ [2006-08-02 22:28:18] rogergg at gmail dot com Description: ------------ the result for $a is 40 exactly. you can check it but i donk know why the if choosed that it is different. the problem is with the result that this take from the equation. if you print the result this show 40 but if you compare this with 40 say that is different thanks for all Reproduce code: --------------- <? $a=((1899-1139.4)*100)/1899; if($a==40) echo "is good $a"; else echo"is bad $a"; ?> Expected result: ---------------- is good 40 Actual result: -------------- is bad 40 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=38300&edit=1