Why does parseFloat(0.15) % 0.05 return 0.04999999999999999?

Question

This code returns: 0.04999999999999999

var number = parseFloat(0.15);
console.log(number % 0.05);

Why?

`parseFloat` parses a string to a number. What's the point of using it on a number? — Oriol, May 02 '16 at 23:10
duplicate of http://stackoverflow.com/questions/1458633/how-to-deal-with-floating-point-number-precision-in-javascript — Stephen Thomas, May 02 '16 at 23:11
In my case "0.15" comes from user input which is a string and I don't know if the user actually entered a number or just some random string. — Fortuna, May 02 '16 at 23:12

score 0 · Answer 1 · answered May 02 '16 at 23:09

0

Floating point math is actually only as good as the bit width representation. For instance, 0.1 is actually 0.100000010000001.

answered May 02 '16 at 23:09

b degnan

The precision is not so low. `0.1 < 0.100000010000001 === true` – Oriol May 02 '16 at 23:14

1 Answers1