CODEWITHSUNDEEP
javascriptfloating-accuracy
Fez Vrasta
Fez Vrasta

Reputation: 14835

Converting big numbers from string to number

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.

Upvotes: 1

Views: 99

Answers (1)

Ian G
Ian G

Reputation: 5536

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?

Upvotes: 2

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