Question

Possible Duplicate:
enum values: NSInteger or int?

What’s the difference between these two enum definitions?

typedef enum : NSUInteger {
    Honda = 1,
    Chevrolet = 2,
    Mercedes = 3,
    Volvo = 4
} CarManufacturer;

and

enum {
    HarleyDavidson = 1,
    BMW = 2,
    Yamaha = 3,
    Kawasaki = 4,
};
typedef NSUInteger MotorcycleManufacturer;

Answer 1

They are essentially the same thing. The difference is that the first one is more “C++-styled” and the second one is more “C-Styled”.

C++ makes some semantic differences, but you can write C-Style enums (that are present throughout the Cocoa frameworks) for backwards compatibility.