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CARM Introduction Compiling Programs Language Extensions 
Preprocessor Header Files 
How #include Works Including Files Once Only Macros Simple Macros Complex Macros Macro Operators Stringize (#) Token Pasting (##) Defined Predefined Macros Undefining and Redefining Macro Caveats Conditional Compilation Preprocessor Directives #pragma #include #define #undef #if #ifdef #ifndef #elif #else #endif #line #error #warning #message Advanced Programming Error Messages Library Reference AppendixMacro Operators
Three preprocessor operators may be used in #define or #if and #elif preprocessor directives.
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