Question

How many different ways are there to define constants in C or C++?

I am already aware of using the const keyword and the #define directive. I heard somewhere that there are two more ways to define constants, but I’ve never seen any others.
Are there any others?

Answer 1

enum, as in enum { some_constant= 2 };

EDIT: I also forgot the additions of constexpr and user defined literals in the C++0x standard. So there are actually three additional ways.