ID: 41632
User updated by: ppyupp at 126 dot com
Reported By: ppyupp at 126 dot com
Status: Bogus
Bug Type: Unknown/Other Function
Operating System: windows linux
PHP Version: 4.4.7
New Comment:
i change the code,like this:
<?php
$t = 1000-182.41;
$t = $t;
$b = 817.59;
var_dump( $t );
var_dump( $b );
var_dump( $t*100 );
var_dump( ceil( $t*100 ) );
if ( $t == $b )
echo '$t == $b';
else
echo '$t != $b';
?>
result:
=============
float(817.59)
float(817.59)
float(81759)
float(81759)
$t == $b
ths result is i want,is true
Previous Comments:
------------------------------------------------------------------------
[2007-06-08 07:00:54] [EMAIL PROTECTED]
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
Thank you for your interest in PHP.
.
------------------------------------------------------------------------
[2007-06-08 05:41:20] ppyupp at 126 dot com
Description:
------------
i think is very bad for operation!!
please run the code!
Reproduce code:
---------------
<?php
$t = 1000-882.41;
$t = $t;
$b = 117.59;
var_dump( $t ); // print 117.59
var_dump( $b ); // print 117.59
var_dump( $t*100 ); // print 11759
var_dump( ceil( $t*100 ) ); //print 11760 (error!!!! must be 11759)
if ( $t == $b )
echo '$t == $b';
else
echo '$t != $b';
?>
Expected result:
----------------
float(117.59)
float(117.59)
float(11759)
float(11759)
$t == $b
Actual result:
--------------
float(117.59)
float(117.59)
float(11759)
float(11760)
$t != $b
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=41632&edit=1
