How to fight Math.floor(17.83 * 100) === 1782 in javascript?

Asked Apr 02 '14 at 11:38

Active Apr 02 '14 at 11:38

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Hi I'm currently working on financial application that requires some special financial arithmetic up to the pennies, I've got into problem when I was doing the following computation:

17.83 * 100 ====> 1782.99999999999...

which is obviously yields Math.floor(1782.99999999999...) to 1782

is there a reasonable and safe method for such kind of computation in JavaScript?

asked Apr 02 '14 at 11:38

Lu4

14,873
15
79
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How do you obtain the value `17.83`? Is it from an input field? If so, don't parseFloat it. Avoid floating point calculations with monetary values. – BoltClock Apr 02 '14 at 11:40
so what do you want? 1782 or 1783? – Amit Joki Apr 02 '14 at 11:41
Use `Math.round()`. And read something about floating point arithmetic. – Alexey Ten Apr 02 '14 at 11:42
Not very elegent, but : Math.floor(Math.ceil(17.83 * 100)) – sdespont Apr 02 '14 at 11:45
I'm using Google Chrome console for testing, Math.floor(Math.ceil(17.83 * 100)) not good since 17.83999 * 100 would yield to 1784 – Lu4 Apr 02 '14 at 12:58
Never, ever use floating point for financial calculations. Always stick to integers (or fixed-point decimals if you have them). – Gilles 'SO- stop being evil' Apr 02 '14 at 16:19

How to fight Math.floor(17.83 * 100) === 1782 in javascript?

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