Why would 0.1 + 0.1 + 0.1 - 0.3 be a very large number?

Question

Java

If you take a double in java, it will be 5.551115123125783E-17, and if it's a float, then 0. In python, float also produces a miracle number. I know this is a noob question, but please help.

Answer 1

at the end of the number 5.551115123125783E-17 there is E-17, this shows the order of the number, i.e. such a number is equal to 0.000000000000055111512, this happens because it is impossible to accurately represent which lib number without error with the float and double types, for example, the same 0.1 will be represented as 0.10000000003

Answer 2

habrahabr.ru/post/112953

Answer 3

it's a rounding error