Is there a data type for decimals that doesn't round?

Question

I know floating point numbers round, so is there a data type I can use like a floating point number that doesn't round? My specific problem is 9.9999999999999999 is returning 10 when I need it to return 9.9999999999999999.

Also, can I set an elemen't width to that value (CSS, like .style.width=9.9999999999999999)?

There's no native decimal number in JavaScript, use a library or a specific format (string, array of digits, etc.) — Denys Séguret, Mar 22 '14 at 16:54

score 0 · Answer 1 · edited May 23 '17 at 11:45

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I think you should take a look at Truncate (not round off) decimal numbers in javascript

It seems to be a very similar use case.

edited May 23 '17 at 11:45

Community

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answered Mar 22 '14 at 16:56

Alexander Jardim

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score 0 · Answer 2 · answered Dec 12 '14 at 13:32

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Perhaps a better question is: why do you need 9.9999999999999999? If you just want the floating point number that is just smaller than 10, then that is 9.999999999999998 (okay, technically it is 9.9999999999999982236431605997495353221893310546875, but 9.999999999999998 should round to this value).

answered Dec 12 '14 at 13:32

Simon Byrne

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Hello, sorry to gravedig four years later but this was a very hypothetical question – Cilan Oct 20 '18 at 20:03

Is there a data type for decimals that doesn't round?

2 Answers2