Bug #52324 [Bgs]: bad result when adding two floats

From: Date: Mon, 12 Jul 2010 22:58:02 +0000
Subject: Bug #52324 [Bgs]: bad result when adding two floats
References: 1  Groups: php.bugs 
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Edit report at http://bugs.php.net/bug.php?id=52324&edit=1

 ID:               52324
 User updated by:  brunog at micro-examples dot com
 Reported by:      brunog at micro-examples dot com
 Summary:          bad result when adding two floats
 Status:           Bogus
 Type:             Bug
 Package:          *General Issues
 Operating System: ubuntu
 PHP Version:      5.2.14RC2

 New Comment:

thank you for the quick reply
adding ini_set('precision',16); does not give correct result value :
0.09999999999999999

is it an echo() bug ?
0.0: is lexicographically before 0.1
0.09 + 0.01 = 0.0: is correct ascii saying


Previous Comments:
------------------------------------------------------------------------
[2010-07-13 00:39:21] rasmus@php.net

prints 0.1 for me.  You are probably hitting a floating point limitation
combined 
with a precision setting problem in your environment.  Try adding 
ini_set('precision',16); to the top of your script and you will see.

------------------------------------------------------------------------
[2010-07-13 00:35:04] brunog at micro-examples dot com

Description:
------------
PHP Version => 5.2.4-2ubuntu5.10
can you please consider this short code ?

Test script:
---------------
<?php
        $f1 = 0.09 ;
        $f2 = 0.01 ;
        $tot = $f1 + $f2 ;
        echo("$tot\n") ;
?>


Expected result:
----------------
0.1


Actual result:
--------------
0.0:


------------------------------------------------------------------------



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Edit this bug report at http://bugs.php.net/bug.php?id=52324&edit=1

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