Question

Does this change the way the values are stored or incremented at all within the enum? If they are the same, why do people define it as 0x000?

Answer 1

No difference, it’s just a readability thing. For instance, it indicates that the enumeration values are used in some sort of binary context, such as bitflags.

enum Flags {
    FLAG_NONE   = 0x0000,
    FLAG_READ   = 0x0001,
    FLAG_WRITE  = 0x0002,
    FLAG_APPEND = 0x0004,
    FLAG_TEXT   = 0x0008,
    FLAG_MEMMAP = 0x0010
};