Edit report at http://bugs.php.net/bug.php?id=51838&edit=1
ID: 51838 Updated by: johan...@php.net Reported by: dawood at menaitech dot com Summary: output problem -Status: Open +Status: Bogus Type: Bug Package: Output Control Operating System: Windows 2003 PHP Version: 5.2SVN-2010-05-17 (snap) 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: ------------------------------------------------------------------------ [2010-05-17 14:11:16] dawood at menaitech dot com Description: ------------ In PHP 5.2.8: echo $x=808.163-961.205+153.042 ; the result should be 0 but the result was: -2.8421709430404E-14 !!!!!!!!!!!!! Test script: --------------- In PHP 5.2.8: echo $x=808.163-961.205+153.042 ; the result should be 0 but the result was: -2.8421709430404E-14 !!!!!!!!!!!!! ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=51838&edit=1
