Question

I understand that something is wrong with type convertations, from my perspective this is really weard:

months is NSArray
so I have no items there:
months.count == 0

this doesn’t work like it should appears 0 < 0 -1 is true?

(0 < months.count -1) == true

but this works fine

(0 < (int)months.count -1) == false

Don’t get why?

Answer 1

count returns NSUInteger, which is unsigned, so months.count -1 is an unsigned expression and is evaluated to positive number, and therefore bigger than 0.

when you cast it to int, the expression (int)months.count -1 is evaluated as signed, and therefore equals to -1, which is smaller than 0.