Bug #74347 [Opn->Nab]: -1 - 0.1 + 1 + 0.1 bugg

Edit report at https://bugs.php.net/bug.php?id=74347&edit=1 ID: 74347 Updated by: requinix@php.net Reported by: stefan at van-echtelt dot nl Summary: -1 - 0.1 + 1 + 0.1 bugg -Status: Open +Status: Not a bug Type: Bug Package: Output Control Operating System: Windows PHP Version: Irrelevant Block user comment: N Private report: N 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://www.floating-point-gui.de/ Thank you for your interest in PHP. Previous Comments: ------------------------------------------------------------------------ [2017-03-31 09:17:42] stefan at van-echtelt dot nl Description: ------------ $test = -1 - 0.1 + 1 + 0.1; print $test; if you print this in php the value will be -8.3266726846887E-17. It should be 0. Test script: --------------- $test = -1 - 0.1 + 1 + 0.1; print $test; ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=74347&edit=1