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1.4 Macros

A macro is a sort of abbreviation which you can define once and then use later. There are many complicated features associated with macros in the C preprocessor.

1.4.1 Simple Macros		Macros that always expand the same way.
1.4.2 Macros with Arguments		Macros that accept arguments that are substituted into the macro expansion.
1.4.3 Predefined Macros		Predefined macros that are always available.
1.4.4 Stringification		Macro arguments converted into string constants.
1.4.5 Concatenation		Building tokens from parts taken from macro arguments.
1.4.6 Undefining Macros		Cancelling a macro's definition.
1.4.7 Redefining Macros		Changing a macro's definition.
1.4.8 Pitfalls and Subtleties of Macros		Macros can confuse the unwary. Here we explain several common problems and strange features.