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Preprocessor Directives

Preprocessor directives are usually placed at the beginning of your source code, but they can legally appear at any point in a program. The preprocessor detects preprocessor directives (also known as control lines) and parses the tokens embedded in them. The preprocessor supports these directives:

# (null directive) | #ifdef
#define | #ifndef
#elif | #undef
#else | #include
#endif | #line
#error | #pragma
#if | #import

Any line with a leading # is taken as a preprocessing directive, unless the # is within a string literal, in a character constant, or embedded in a comment. The initial # can be preceded or followed by whitespace (excluding new lines).

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