Question

I have 2 different classes but same primitive type declaration as you see below

int x = 0;
- (void)viewDidLoad{
[super viewDidLoad];
}

if I change one of them name “x” to “y” there is no error? WHY? seperate classes same variable whats the problem???

Answer 1

That’s because the variable x is shared among classes. I think (but never tried) if you declare extern int x in another file, you could share the x variable.

Try static int x = 0. In general, always declare an internal class variable as static unless you want to share it with another file.