Tricky null?

Question

Who can explain that? Null isn't equal to zero but if increment null it will be 1.
https://code.sololearn.com/W815R83fIHyA/?ref=app

Answer 1

coerce to not equal to 0 maybe :/
(Wait another ans)

Answer 2

null is not zero , null is nothing and the data type of null is none whereas zero is integer type unlike null .
if we add 1 in nothing (null) then it will be 1 as in zero.

in another word null is like an empty box but in case of zero , it has its value i.e "0"