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Cx51 User's Guide
Cx51 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 Preprocessor Directives Conditional Compilation #define #elif #else #endif #error #if #ifdef #ifndef #include #line #message #pragma #undef #warning Advanced Programming 8051 Derivatives Error Messages Library Reference AppendixMacro Operators
Three preprocessor operators may be used in #define or #if and #elif preprocessor directives. They are:
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