Bug #64742 [Opn->Nab]: float(1) casts to int as 0
Edit report at https://bugs.php.net/bug.php?id=64742&edit=1
ID: 64742
Updated by: johannes@php.net
Reported by: bondo dot the dot clown at gmail dot com
Summary: float(1) casts to int as 0
-Status: Open
+Status: Not a bug
Type: Bug
Package: Math related
Operating System: linux
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.
8.95 - 7.95 is not exactly 1 (int) rounds down.
$ php -d precision=99 -r 'echo 8.95 - 7.95;'
0.99999999999999911182158029987476766109466552734375
Previous Comments:
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[2013-04-30 14:37:11] bondo dot the dot clown at gmail dot com
Description:
------------
code speaks for himself
php --version
PHP 5.4.6-1ubuntu1.2 (cli) (built: Mar 11 2013 14:57:54)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies
with XCache v2.0.0, Copyright (c) 2005-2012, by mOo
with Xdebug v2.2.1, Copyright (c) 2002-2012, by Derick Rethans
Test script:
---------------
echo (int)(8.95 - 7.95);
Expected result:
----------------
1
Actual result:
--------------
0
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Edit this bug report at https://bugs.php.net/bug.php?id=64742&edit=1
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