Bug #53972 [Bgs]: Operator Type Casting Issue
Edit report at http://bugs.php.net/bug.php?id=53972&edit=1
ID: 53972
Updated by: johannes@php.net
Reported by: thipse_rahul at rediffmail dot com
Summary: Operator Type Casting Issue
Status: Bogus
Type: Bug
Package: *General Issues
Operating System: Linux/Windows
PHP Version: 5.3.5
Block user comment: N
Private report: N
New Comment:
0.1+0.9 is not exactly 1 but a tiny bit less. (int) rounds down.
Previous Comments:
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[2011-02-10 05:16:35] thipse_rahul at rediffmail dot com
Thanks for reply johannes
Yes I agree for float,
Then Whey Case(2) & Case(3) gives wrong result.
Case 2:
$a = (int)((0.1+0.6) * 10); echo $a; // Act.Result: 7 // Exp. : 6
Case 3:
$a = (int)((0.1+0.8) * 10); echo $a; // Act.Result: 9 // Exp.: 8
Hope you will give satisfactory feedback.
Thanks!
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[2011-02-09 17:43:25] anon at anon dot anon
PHP guys, will you please stop giving people broken links?
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[2011-02-09 14:18:33] johannes@php.net
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.
.
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[2011-02-09 13:56:31] thipse_rahul at rediffmail dot com
Description:
------------
Following code snippet --
Case 1:
$a = (int)((0.1+0.7) * 10); echo $a; // Result: 7 (Wrong) should give 8
Case 2:
$a = (int)((0.1+0.6) * 10); echo $a; // Result: 7
Case 3:
$a = (int)((0.1+0.8) * 10); echo $a; // Result: 9
Test script:
---------------
$a = (int)((0.1+0.7) * 10);
echo $a;
Expected result:
----------------
8
Actual result:
--------------
7
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Edit this bug report at http://bugs.php.net/bug.php?id=53972&edit=1
Thread (5 messages)