Edit report at https://bugs.php.net/bug.php?id=55409&edit=1
ID: 55409
Updated by: larue...@php.net
Reported by: php-bugs at nickshanks dot com
Summary: Casting floats containing an integer to ints gives
wrong result
-Status: Open
+Status: Bogus
Type: Bug
Package: Math related
Operating System: Irrelevant
PHP Version: Irrelevant
Block user comment: N
Private report: N
New Comment:
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.
Previous Comments:
------------------------------------------------------------------------
[2011-08-13 10:38:31] larue...@php.net
Float values have a limited precision. Hence a value might
not have the same string representation after any processing. That also
includes writing a float number in your script and directly printing it without
any mathematical operations.
Thank you for your interest in PHP.
------------------------------------------------------------------------
[2011-08-12 07:48:19] php-bugs at nickshanks dot com
Description:
------------
Casting of certain floating-point values, containing just of an integer
component
and a zero fractional component, to an integer results in wrong value.
Test script:
---------------
echo '32.55' * 100;
echo "\n";
echo (int)('32.55' * 100);
Expected result:
----------------
3255
3255
Actual result:
--------------
3255
3254
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=55409&edit=1
