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Bug #63303 adding 2 decimals number, returned 13 decimal point ?
Submitted: 2012-10-18 09:37 UTC Modified: 2012-10-18 14:17 UTC
From: mikeyap2005 at gmail dot com Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.3.17 OS: windows 7
Private report: No CVE-ID: None
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 [2012-10-18 09:37 UTC] mikeyap2005 at gmail dot com 
Description:
------------
echo (47659.45-47658.35);
// will return 1.0999999999985, which 13 decimals point
// should return "1.10" right ? why "1.0999999999985" ?

Expected result:
----------------
1.10

Actual result:
--------------
1.0999999999985

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 [2012-10-18 13:17 UTC] nikic@php.net
-Status: Open +Status: Not a bug
 [2012-10-18 13:17 UTC] nikic@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://www.floating-point-gui.de/

Thank you for your interest in PHP.
 [2012-10-18 14:17 UTC] mikeyap2005 at gmail dot com 
thanks for your quick response.
 
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