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Bug #64491 float numbers won't add up
Submitted: 2013-03-22 14:09 UTC Modified: 2013-03-22 14:13 UTC
From: mihai at iorga dot eu Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.4.13 OS: any
Private report: No CVE-ID: None
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From: mihai at iorga dot eu
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 [2013-03-22 14:09 UTC] mihai at iorga dot eu 
Description:
------------
echo (int)((0.1 + 0.7) * 10);

Test script:
---------------
echo (int)((0.1 + 0.7) * 10);

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 [2013-03-22 14:13 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.
 [2013-03-22 14:13 UTC] nikic@php.net
-Status: Open +Status: Not a bug
 
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