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Issue 899661 link

Starred by 1 user
Status: WontFix
Owner: ----
Closed: Nov 1
Cc:
susan.boorgula@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux , Windows , Mac
Pri: 2
Type: Bug



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The value is calculated incorrectly

Reported by aleksey....@outlook.com, Oct 29 
UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36

Steps to reproduce the problem:
1. 2/7 => 0.2857142857142857
2. (2/7).toFixed(2) = > "0.29"
3. parseFloat((2/7).toFixed(2)) => 0.29
4. parseFloat((2/7).toFixed(2))*100 => 28.999999999999996

What is the expected behavior?
parseFloat((2/7).toFixed(2))*100 => 29

What went wrong?
parseFloat((2/7).toFixed(2))*100 => 28.999999999999996

Did this work before? N/A 

Chrome version: 70.0.3538.77  Channel: stable
OS Version: 10.0
Flash Version: 

In IE works correctly

Comment 1 by woxxom@gmail.com, Oct 29 

The observed behavior is correct as per the JavaScript specification that defines numbers in IEEE 754 format:
http://www.ecma-international.org/ecma-262/8.0/index.html#sec-terms-and-definitions-number-value

It's possible IE applies nonstandard tweaks in this case, but it's not in the specification.

You can find many explanations for the observed behavior, for example:
https://stackoverflow.com/questions/588004/is-floating-point-math-broken

Comment 2 by krajshree@chromium.org, Oct 29

Labels: Needs-Triage-M70

Comment 3 by susan.boorgula@chromium.org, Oct 30

Cc: susan.boorgula@chromium.org
Labels: Triaged-ET Target-72 M-72 FoundIn-71 FoundIn-70 FoundIn-72 OS-Linux OS-Mac
Status: Untriaged (was: Unconfirmed)
aleksey.grigorev@ Thanks for the issue.

Able to reproduce the issue on Windows 10, Mac OS 10.13.6 and Ubuntu 17.10 on the latest Stable 70.0.3538.77 and the latest Canary 72.0.3596.0.
Attached is the screen shot for reference.

This is a Non-Regression issue as this is observed from M-60 chrome builds.
Hence marking this as Untriaged for further updates from Dev.

Thanks..
899661-M60.PNG
44.6 KB View Download

Comment 4 by rbyers@chromium.org, Nov 1

Components: -Blink Blink>JavaScript
Status: WontFix (was: Untriaged)
Agree with the explanation in #1 - this is how floating point math works.
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