Wrong calculations and how to fix it?

Question

Python

I have an example: 0.999999999988288 - 1.0
comes out: -1.1711964731375701e-11

although this should not be acceptable, what is it and how to fix it
and by the way if you bring 0.999999999988288 to 0.999 then: 0.999 - 1.0 =
-0.00100000000000

Answer 1

What you got is called a floating point number, in order to adjust the number of decimal places you can write like this print('{:.2f}'.format(value)), but what you get is an inaccurate number, so this is normal, so this is a feature of the representation of floating point numbers.