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Bug #53337 a count error
Submitted: 2010-11-18 06:22 UTC Modified: 2010-11-18 06:30 UTC
From: richcem at 163 dot com Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: 5.2.14 OS: xp sp3
Private report: No CVE-ID: None
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 [2010-11-18 06:22 UTC] richcem at 163 dot com 
Description:
------------
echo 100-99.9; //0.099999999999994

Test script:
---------------
echo 100-99.9; //0.099999999999994

Expected result:
----------------
//exp : 0.1
echo 100-99.9; //0.099999999999994

Actual result:
--------------
0.099999999999994

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 [2010-11-18 06:30 UTC] rasmus@php.net
-Status: Open +Status: Bogus
 [2010-11-18 06:30 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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