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Bug #28536 Invalid Calculation: 90.99-90.00 = 0.98999999999999 ... when it should be 0.99
Submitted: 2004-05-26 22:04 UTC Modified: 2004-05-26 22:06 UTC
From: hart0550 at umn dot edu Assigned:
Status: Not a bug Package: Math related
PHP Version: 4.3.4 OS: Linux
Private report: No CVE-ID: None
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 [2004-05-26 22:04 UTC] hart0550 at umn dot edu 
Description:
------------
When calculating 90.99 minus 90.00 it returns 0.98999999999999 which is a bit big for a simple subtraction of two floats that only have 2 decimal numbers.

Reproduce code:
---------------
<?php

	$calc = 90.99 - 90.00;
	print $calc;

?>

Expected result:
----------------
.99

Actual result:
--------------
0.98999999999999

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 [2004-05-26 22:06 UTC] gschlossnagle@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

Welcome to the world of floating point numbers.  This is 
how it works.
 
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