Javascript - simple division leads to error

Question

If I use the windows calculator to calculate

(1.75 + 3/1.75)/2 it yields to =

1,7321428571428571428571428571429

If I do the same with javascript it yields to

1.732142857142857206298458550009

So at position 22 after the decimal point the result becomes incorrect ...142857... vs. ...206298...

var a = 1.75;
var res = (a+3/a)/2;
console.log(res.toFixed(30));

How can I make my division precise for 31 digits after the decimal comma?

Check [this post](http://stackoverflow.com/questions/4288821/how-to-deal-with-big-numbers-in-javascript). — DontVoteMeDown, Jan 15 '15 at 12:35

score 1 · Answer 1 · answered Jan 15 '15 at 12:49

1

Javascript can't do that "per se", since its double variables have a limited precision. You'll need to use an external library to handle operations with big precision numbers, like this one: Javascript Bignum

answered Jan 15 '15 at 12:49

Joanvo

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Javascript - simple division leads to error

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