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Possible Duplicate:
Is JavaScript’s Math broken?
In Javascript, I cannot figure out why 230/100*100 returns 229.99999999999997, while 240/100*100 returns 240.
This also applies to 460, 920 and so on…
Is there any solution?
In JavaScript all numeric values are stored as IEEE 754 64-bit floating-point values (also known as
doublein many languages). This representation has only finite precision (so not all numbers can be accurately represented) and it is binary, so values that seem to be easy to represent in decimal can turn out to be problematic to handle.There is no fire-and-forget solution suitable for everyone. If you need an integer then simply round using
Math.round.