#44405 [Opn->Bgs]: Math calculation problem with 1.19 - 1

ID: 44405 Updated by: pajoye@php.net Reported By: thbley at gmail dot com -Status: Open +Status: Bogus Bug Type: *General Issues Operating System: WinVista PHP Version: 5.2.5 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: ------------------------------------------------------------------------ [2008-03-11 11:04:00] thbley at gmail dot com Description: ------------ There seems to be a problem with the numeric calculation: if ( (1.19 - 1) == 0.19 ) { echo "@@"; } The expression "(1.19 - 1) == 0.19" does not evaluate to true. My environments (problem exists on both platforms): WinVista: PHP 5.25 Debian: 5.2.0-8+etch10 Reproduce code: --------------- if ( (1.19 - 1) == 0.19 ) { echo "@@"; } Expected result: ---------------- output: @@ Actual result: -------------- output: <nothing> ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=44405&edit=1