php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #76515 if you multiply 1.9 by 3 and if you ta subtract the same the result is not zero
Submitted: 2018-06-22 02:34 UTC Modified: 2018-06-22 02:35 UTC
From: manuel dot cs dot hr at gmail dot com Assigned:
Status: Not a bug Package: Math related
PHP Version: 7.0Git-2018-06-22 (Git) OS: Linux
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: manuel dot cs dot hr at gmail dot com
New email:
PHP Version: OS:

 

 [2018-06-22 02:34 UTC] manuel dot cs dot hr at gmail dot com 
Description:
------------
if you multiply 1.9 by 3 the result is 5.7
and if you ta subtract the result 5.7 the answer is not zero

Test script:
---------------
<?php
$qty = 3;
$val1 = 1.9;
$discount = 5.7;

$items_ = $val1 * $qty ;

$result = $items_ - $discount;

var_dump($result);


?>

Expected result:
----------------
$result = 0;

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2018-06-22 02:35 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2018-06-22 02:35 UTC] requinix@php.net 
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.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Sun Dec 22 01:01:30 2024 UTC