Console.log(sum of a bunch of num) return weird number

[icest0]

I’m currently doing the last project of javascript algorithm.

Here is my code

console.log(60 + 20 + 15 + 1 + 0.50 + 0.20 + 0.04)

the output is 96.74000000000001

the problem seems to be the last number “0.04” if I change it to “0.03” or “0.05” it works fine.

[JeremyLT]

You have discovered one of the problems with floating point values. Computers can’t exactly store decimal numbers, so the arithmetic will have rounding errors.

I recommend using a whole number of cents instead. No decimals means no rounding.

[ilenia]

a computer can’t store precisely decimal numbers
You can get some more explanation in this video:

Floating Point Numbers - Computerphile

[icest0]

that was very quick, I have also seen ieahleen’s reply. I will check the video out, thanks you so much.