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Bug #50975 Floating point match Failure
Submitted: 2010-02-09 16:43 UTC Modified: 2010-02-09 16:44 UTC
From: dmgx dot michael at gmail dot com Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 5.3.1 OS: Windows & Linux
Private report: No CVE-ID: None
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 [2010-02-09 16:43 UTC] dmgx dot michael at gmail dot com 
Description:
------------
What is 34.2 - 33.98? I don't think the answer needs 15 digits.

Reproduce code:
---------------
<?php echo 34.2 - 33.98 ?>

Expected result:
----------------
0.22

Actual result:
--------------
0.22000000000001

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 [2010-02-09 16:44 UTC] rasmus@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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