Directives to the Preprocessor

A "directive" instructs the C preprocessor to perform a specific action on the text of the program before compilation. Preprocessor directives are fully described in the Preprocessor Reference. This example uses the preprocessor directive #define:

#define MAX 100

This statement tells the compiler to replace each occurrence of MAX by 100 before compilation. The C compiler preprocessor directives are:

See also

Source Files and Source Programs