javascript sum with parseFloat giving wronge value

Question

function myFunction() {
    var c = parseFloat("10.81") +parseFloat("10.00");
alert(c);
}

//output is 20.810000000000002 why?

Floating point arithmetic is not exact in most languages. – Tim Biegeleisen Mar 15 '18 at 08:42 — Tim Biegeleisen, Mar 15 '18 at 08:42

score 0 · Answer 1 · answered Mar 15 '18 at 08:43

You can use toFixed to get the precision to two digit floating number. In that case you will get the desired result:

function myFunction() {
  var c = parseFloat("10.81") +parseFloat("10.00");
  alert(c.toFixed(2));
}
//output is 20.810000000000002 why?

myFunction();

javascript sum with parseFloat giving wronge value

1 Answers1