Class variable defined at @implementation rather than @interface?

Question

I\'m new to Objective-C, but I am curious about something that I haven\'t really seen addressed anywhere else.

Could anyone tell me what is the difference between a

Answer 1

If you declare a variable inside the @implementation section, you're actually creating a global variable, visible everywhere (in every method in your application).

Member variables can only be declared in the @interface section. They are only accessible in the class itself.