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Bug #35667 Wrong result from round()
Submitted: 2005-12-14 12:34 UTC Modified: 2005-12-14 12:40 UTC
From: gerald dot hoch at net-man dot at Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.1.1 OS: win32
Private report: No CVE-ID: None
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From: gerald dot hoch at net-man dot at
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 [2005-12-14 12:34 UTC] 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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 [2005-12-14 12:40 UTC] derick@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://docs.sun.com/source/806-3568/ncg_goldberg.html
 
Thank you for your interest in PHP.

.
 
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