#35667 [Opn->Bgs]: Wrong result from round()

From: Date: Wed, 14 Dec 2005 11:40:51 +0000
Subject: #35667 [Opn->Bgs]: Wrong result from round()
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-90428@lists.php.net to get a copy of this message 
 ID:               35667
 Updated by:       derick@php.net
 Reported By:      gerald dot hoch at net-man dot at
-Status:           Open
+Status:           Bogus
 Bug Type:         Math related
 Operating System: win32
 PHP Version:      5.1.1
 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:
------------------------------------------------------------------------

[2005-12-14 12:34:37] gerald dot hoch at net-man dot at

Description:
------------
I have some troubles with following round() function.
I think the operation +1 produces the problem.




Reproduce code:
---------------
var_dump(round(65536.335,2));
var_dump(round(65535.335 + 1,2));


Expected result:
----------------
float(65536.34)
float(65536.34)


Actual result:
--------------
float(65536.34)
float(65536.33)



------------------------------------------------------------------------


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