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Bug #39900 intval error
Submitted: 2006-12-20 12:42 UTC Modified: 2006-12-20 12:54 UTC
From: alexsum at ua dot fm Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 5.2.0 OS: Windows 2000 XP
Private report: No CVE-ID: None
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From: alexsum at ua dot fm
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 [2006-12-20 12:42 UTC] alexsum at ua dot fm 
Description:
------------
why
in "echo $n*100-intval($n)*100" output :92
but
in "echo intval($n*100-intval($n)*100)" output ^91

Reproduce code:
---------------
intval(142.92*100-intval($n)*100)

Expected result:
----------------
92

Actual result:
--------------
91

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 [2006-12-20 12:54 UTC] tony2001@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
 
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