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| ## page was renamed from Functions and Program Structure/4.11 The C Preprocessor |
4.11 The C Preprocessor
C provides certain language facilities by means of a preprocessor, which is conceptionally a separate first step in compilation. The two most frequently used features are #include, to include the contents of a file during compilation, and #define, to replace a token by an arbitrary sequence of characters. Other features described in this section include conditional compilation and macros with arguments.