Javascript - How to squared a number?

Question

Using the javascript function

function squareIt(number) {
   return number * number;
}

When given the number 4294967296 the function returns 18446744073709552000 is returned

Everyone knows the real answer is 18446744073709551616 :-)

I guess this is to to with rounding on my 32-bit machine. However, would this script give the right answer on a 64 bit machine? Has anyone tried this?

score 3 · Accepted Answer · edited May 23 '17 at 10:27

3

ChrisV- see this post. Also it easier for people to evaluate your question by typing the following JavaScript directly into the browser URL textbox:

javascript:4294967296*4294967296

edited May 23 '17 at 10:27

Community

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answered May 19 '09 at 11:06

RichardOD

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score 2 · Answer 2 · answered May 19 '09 at 11:02

2

what about this

function squareIt(number){
return Math.pow(number,2)
}

answered May 19 '09 at 11:02

Konstantinos

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um, did you bother testing it? You would know the answer. – epascarello May 19 '09 at 14:06
yeah, and it returns 18446744073709552000 – Konstantinos May 19 '09 at 14:57

score 1 · Answer 3 · answered May 19 '09 at 11:00

1

Javascript uses 64 bit floating point arithmetic internally for numerical calculations - the results you see are a reflection of this, and will happene regardless of the underlying architecture.

answered May 19 '09 at 11:00

PaulJWilliams

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score 0 · Answer 4 · answered Dec 07 '18 at 14:26

0

Here is one more example based on BigInteger.js.

alert(bigInt(4294967296).square());

<script src="https://cdnjs.cloudflare.com/ajax/libs/big-integer/1.6.40/BigInteger.min.js"></script>

answered Dec 07 '18 at 14:26

Penny Liu

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Javascript - How to squared a number?

4 Answers4

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