I know there's
Math.floorparseInt
But about this case:
Math.floor(1.99999999999999999999999999)
returning 2, how could I obtain only its integer part, equals to 1?
How to obtain only the integer part of a long floating precision number with JS?
1k Views Asked by diegoaguilar At
1
There are 1 best solutions below
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1.99999999999999999999999999is not the actual value of the number. It has a value of 2 after the literal is parsed because this is 'as best' as JavaScript can represent such a value.JavaScript numbers are IEEE-754 binary64 or "double precision" which allow for 15 to 17 significant [decimal] digits of precision - the literal shown requires 27 significant digits which results in information loss.
Test:
1.99999999999999999999999999 === 2(which results in true).Here is another answer of mine that describes the issue; the finite relative precision is the problem.