Objective C convert number to NSNumber

Question

Why doesn\'t this please the compiler? Casting is supposed to work like in C as I can read here How to cast an object in Objective-C.

[p setAge:(NSNumber*)10         


        

Answer 1

Because NSNumber is an object and "10" in a primitive integer type, much like the difference between int and Integer in Java. You, therefore, need to call its initialiser:

[p setAge:[NSNumber numberWithInt:10]