Bug #63303 [Opn->Nab]: adding 2 decimals number, returned 13 decimal point ?

From: Date: Thu, 18 Oct 2012 13:17:24 +0000
Subject: Bug #63303 [Opn->Nab]: adding 2 decimals number, returned 13 decimal point ?
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-174141@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=63303&edit=1

 ID:                 63303
 Updated by:         nikic@php.net
 Reported by:        mikeyap2005 at gmail dot com
 Summary:            adding 2 decimals number, returned 13 decimal point
                     ?
-Status:             Open
+Status:             Not a bug
 Type:               Bug
 Package:            Math related
 Operating System:   windows 7
 PHP Version:        5.3.17
 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:
------------------------------------------------------------------------
[2012-10-18 09:37:41] mikeyap2005 at gmail dot com

Description:
------------
echo (47659.45-47658.35);
// will return 1.0999999999985, which 13 decimals point
// should return "1.10" right ? why "1.0999999999985" ?

Expected result:
----------------
1.10

Actual result:
--------------
1.0999999999985


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



-- 
Edit this bug report at https://bugs.php.net/bug.php?id=63303&edit=1

Thread (3 messages)

« previous php.bugs (#174141) next »