I have a problem with add negative numbers jquery, code:
var k = parseFloat(-0.1) + parseFloat(0.3);
console.log(k); // 0.19999999999999998
but i need results 0.2
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Alex K.
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Alexandex Grigorean
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Also see [Is floating point math broken?](http://stackoverflow.com/questions/588004/is-floating-point-math-broken) – Alex K. Apr 15 '17 at 17:49
1 Answers
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This has to do with how computer's parse numbers, specifically the floating point representation. 0.1 is 1/10 which cannot be exactly represented by a number of base 2 (i.e. 2^n).
If you can accept some rounding error I would refer you to this answer, and do something like this:
var k = parseFloat(-0.1) + parseFloat(0.3);
k = Math.round(k * 100) / 100; // 2 decimal points precision. Use 10 instead of 100 for 1 decimal point precision.
console.log(k); // 0.2 :)
Hope this helps.
