Incorrect results in calculations with decimal values with four digits after dot

Question

I have a JavaScript function that returns the result of multiplications using decimal values (four digits after dot).

But, in some conditions, the result is a mess like this:

3.9050 * 9 = 35.144999999999996.

What should I do to normalize those results?

Must be answered a million times, but couldn't find one quickly. This link is pretty good though: http://blog.reverberate.org/2014/09/what-every-computer-programmer-should.html — wvdz, Jan 27 '16 at 18:53
Answered pretty well here: http://stackoverflow.com/questions/1458633/how-to-deal-with-floating-point-number-precision-in-javascript — murdock, Jan 27 '16 at 18:55

score 0 · Accepted Answer · answered Jan 27 '16 at 18:56

0

Use .toFixed(numberOfDecsYouWant)

var num = 3.9050 * 9;
console.log(num);  //35.144999999999996
console.log(num.toFixed(4))  //35.1450

answered Jan 27 '16 at 18:56

kpucha

That's exactly what I want. Thanks! – Eduardo Likoski Prestes Jan 27 '16 at 19:20
Please guys, try to understand better the questions and the possible existing answers before criticize and mark as duplicated, cause I've searched hard before ask e I didn't find any answer as good as I get here by kpucha. – Eduardo Likoski Prestes Jan 27 '16 at 20:05
They think you are asking why, but obviiously you are asking for a fix... they flagged as duplicated with an answer of why instead of how. – kpucha Jan 27 '16 at 20:07

1 Answers1