Converting big numbers from string to number

Question

I'm trying to convert a big/very long numeric string into a number:

+'-000000098765432112345.67898765432100000';
'-000000098765432112345.67898765432100000'*1;
parseFloat('-000000098765432112345.67898765432100000', 10);

All these tests will output -98765432112345.67 instead of the expected -98765432112345.678987654321.

Why does it happens?

NB: The proposed duplicated solution doesn't answer my question, it just gives a solution to the problem.

Possible duplicate of What is the standard solution in Javascript for handling big numbers (BigNum)? — Ian G
– Ian G, Commented Jan 18, 2016 at 11:21
It doesn't answer my question, I want to know why it happens. — Fez Vrasta
– Fez Vrasta, Commented Jan 18, 2016 at 11:23

Community · Accepted Answer · 2017-05-23 12:23:30Z

2

The usual cause with big numbers is because of overflow: https://en.wikipedia.org/wiki/Arithmetic_overflow.

This answers the similar question 'at what point will overflow occur in Javascript': What is JavaScript's highest integer value that a Number can go to without losing precision?

edited May 23, 2017 at 12:23

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answered Jan 18, 2016 at 11:25

Ian G

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