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From: Mostowski Collapse <janburse@fastmail.fm>
Newsgroups: comp.lang.javascript
Subject: Re: Are Floating Point Numbers still a Can of Worms?
Date: Sat, 15 Oct 2022 14:25:39 +0200
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I stepped over the example originally via Java and
not JavaScript. I find the following discrepancy between
JDK 19 and JDK 1.8, using Math.pow(), on Windows:

/* JDK 1.8 Windows Nok */
?- X is 1889**29.
X = 1.0250068783051206E95.

/* JDK 19 Windows Ok */
?- X is 1889**29.
X = 1.0250068783051207E95.

?- X is 1.0250068783051207E95-1.0250068783051206E95.
X = 1.4821387422376473E79.

Then I went on and tested nodeJS a little bit. You
can compare with Python as well. I get the following
result, namely the more accurate result, what the

HALF_EVEN rounding of the exact pow() gives:

/* Python 3.11.0rc1 Windows  Ok */
 >>> 1889**29.0
1.0250068783051207e+95

Would it be possible to upgrade nodeJS somehow?
Maybe I should post in a nodeJS forum. But the error
happens also in Browsers JavaScript, like in Chrome:

/* Chrome Windows Nok */
?- X is 1889**29.
X = 1.0250068783051206E95.

So I guess nodeJS might have imported the error from
Chrome V8 or something. It doesn't happen in FireFox:

/* FireFox Windows Ok */
?- X is 1889**29.
X = 1.0250068783051207E95.

Mostowski Collapse schrieb:
> Welcome to Node.js v18.9.0.
> 
>> 1889**29
> 1.0250068783051206e+95
>> Number(BigInt(1889)**BigInt(29))
> 1.0250068783051207e+95
>