Macros

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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.

See the following documentation for more detailed discussion of macros.

Simple macros
Macros with arguments
Predefined macros

Standard predefined macros
Nonstandard predefined macros

Stringification
Concatenation
Undefining macros
Redefining macros
Pitfalls and subtleties of macros

Improperly nested constructs
Unintended grouping of arithmetic
Swallowing the semicolon
Duplication of side effects
Self-referential macros
Separate expansion of macro arguments
Cascaded use of macros
Newlines in macro arguments

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