Strange addition of numbers, why?

Asked Feb 08 '14 at 18:59

Active Feb 08 '14 at 18:59

Viewed 23 times

Doing:

 0 + 0.1 + 0.1 + 0.1

In Safari and Chrome results in:

 0.30000000000000004

At least when displayed as a string, for example:

 console.log( 0 + 0.1 + 0.1 + 0.1 );

Making the string assumption because the following returns 4:

 0 + 0.1 + 0.1 + 0.1 + 0.1

What is the reason behind this?

asked Feb 08 '14 at 18:59

Ross

3

http://floating-point-gui.de/ – Oliver Charlesworth Feb 08 '14 at 19:01
Your question is really not clear - you say, "displayed as a string", but there are no strings in the code you posted. – Pointy Feb 08 '14 at 19:02
See also [Python math is wrong](http://stackoverflow.com/questions/11950819/python-math-is-wrong), though the question is about python the answer is same – Feb 08 '14 at 19:05
@Pointy console.log prints a string representation of a Number yeah? – Ross Feb 08 '14 at 19:09

0 Answers0