Whats the difference between… > NULL, 0, and nul?
NULL is a macro defined in several standard headers, 0 is an integer constant, ‘\0’ is a character constant, and nul is the name of the character constant. All of these are *not* interchangeable: NULL is to be used for pointers only since it may be defined as ((void *)0), this would cause problems with anything but pointers. 0 can be used anywhere, it is the generic symbol for each type’s zero value and the compiler will sort things out. ‘\0’ should be used only in a character context.
