Bug with outputting long numbers in javascript

Question

Here is the code:

var q = 10000000000000011;
console.log(q);

Output will be:

10000000000000012

If I try to output 10000000000000010 or 10000000000000012, everything is fine. Conversion to string doesn't help either. How can I avoid this bug?

Javascript can not represent such big numbers accurately - instead it will convert to closest even number. There are various libraries for handling big numbers. — ankr
– ankr, Commented Aug 29, 2017 at 10:08
Thank you guys for quick response. Link which helped me with the case github.com/MikeMcl/big.js — scipios
– scipios, Commented Aug 29, 2017 at 10:23

marvel308 · Accepted Answer · 2017-08-29 10:08:06Z

4

The maximum safe integer in JavaScript (2^53 - 1). which is 9007199254740991. You will need to use a big integer library to store such large numbers

answered Aug 29, 2017 at 10:08

marvel308

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2 Comments

arthurakay Over a year ago

Number.MAX_SAFE_INTEGER

Adrian Over a year ago

I'll leave this here, someone might find it useful ... or not.. ecma262-5.com/ELS5_HTML.htm#Section_8.5

arthurakay · Accepted Answer · 2017-08-29 10:13:33Z

0

As has been pointed out, the maximum integer size in JS is Number.MAX_SAFE_INTEGER (9007199254740991)

So if you want larger numbers, you'll have to get creative and use something like scientific notation:

10000000000000011 ~= 1 × 10^9 (1e9)

answered Aug 29, 2017 at 10:13

arthurakay

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