Strange result of simple calculus

Web Development
1

Hello.
Can someone simply explain me strange results I got when adding simple floats? For example:

let x = 200.16;
let y = 60;
console.log(x + y) // logs: 260.15999999999997

How to do it properly. I tried almost everything (changing int (y) into float, parse both variable as floats ect).

Thanks in advance.
Best regards.
Kamil

2

260.15999999999997 should be considered the same as 260.16
That’s an issue with floating point numbers (and the numbers being stored as binary in a computer)
The .16 would be a decimal that would go on forever in binary digits (much like 1/3 = 0.33333… goes on forever in our base-10 number system) so it can’t be stored perfectly as a binary number in a limited amount of space (which means a limited number of digits).