JavaScript -- 0.56 + 4 = 4.5600000000000005

Asked Apr 05 '13 at 18:08

Active Apr 05 '13 at 18:08

Viewed 59 times

Just had fun tracking down this weird glitch. You can open up console and type in 0.56 + 4 which will give you 4.5600000000000005 in JavaScript. I'm using Chrome Version 26.0.1410.43

Haven't tried in other browsers.

I know about rounding error but what's going on here exactly?

asked Apr 05 '13 at 18:08

ilovett

3,240
33
39

4

Binary floating point math. – Pointy Apr 05 '13 at 18:09
2

http://stackoverflow.com/questions/1458633/elegant-workaround-for-javascript-floating-point-number-problem – spots Apr 05 '13 at 18:10
If you don't understand what's going on here, you don't "know about rounding error". – Ted Hopp Apr 05 '13 at 18:15
I didn't realize it could happen at such a high level / small amount of decimal places. – ilovett Apr 05 '13 at 20:20

JavaScript -- 0.56 + 4 = 4.5600000000000005

0 Answers0