Mysterious calculation error when multiply by 100

Question

The following script contains a very strange error. I want to check if a value is a positive integer. To do this, I multiply by 100 to enclose the value to decimal. If I tes

Answer 1

That's because javascript casts everything to a double internally. As a result, all calculations pick up some noise due to floating point inaccuracy: Floating point inaccuracy examples

One way to fix this issue, is to just round down to the nearest int after all intermediate calculations.