Bug 31777 - Number.toFixed returns wrong values
Summary: Number.toFixed returns wrong values
Status: RESOLVED DUPLICATE of bug 24711
Alias: None
Product: WebKit
Classification: Unclassified
Component: WebCore JavaScript (show other bugs)
Version: 528+ (Nightly build)
Hardware: PC Windows 7
: P2 Major
Assignee: Nobody
URL: http://pc44.one.pl/goorol/bugs/chrome...
Keywords:
Depends on:
Blocks:
 
Reported: 2009-11-21 16:50 PST by bugzilla33
Modified: 2010-08-27 12:56 PDT (History)
1 user (show)

See Also:

Attachments
source (1.48 KB, text/html)
2009-11-21 16:50 PST, bugzilla33 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description bugzilla33 2009-11-21 16:50:01 PST 
Created attachment 43667 [details]
source

Number.toFixed returns sometimes wrong values (incorect rounding).

Please run attachment.


Actual Results:  

( 0.95 ) . toFixed ( 1 ) = 0.9
THOUGH
( 9.5 ) . toFixed ( 0 ) = 10


Expected Results:  

( 0.95 ) . toFixed ( 1 ) = 1.0
LIKE
( 9.5 ) . toFixed ( 0 ) = 10
Comment 1 Alexey Proskuryakov 2009-11-21 22:55:08 PST 
Duplicate of bug 24711?
Comment 2 bugzilla33 2009-11-22 01:06:09 PST 
toFixed rounds, not floors !
bug 24711 is not a Bug !!

(1.95) . toFixed( 1 ) = 2.0

because:

Math.round ( 1.95 * 10 ) / 10
equal 2
Comment 3 bugzilla33 2009-11-22 01:14:34 PST 
All browsers before returns string value (IE, Opera, Konqueror, Chrome, Firefox) rounding a Number.
Comment 4 Gavin Barraclough 2010-08-27 12:56:54 PDT 
yep, this is a dupe.

ieee754(.95) < decimal(.95), hence rounds up to 0.9 (ecma-262 15.7.4.5 requires we select the nearest value).
ieee754(9.5) == decimal(9.5), hence rounds up to 10 (ecma-262 15.7.4.5 requires we select the larger to two equally near values).

*** This bug has been marked as a duplicate of bug 24711 ***