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Technical Support
On-Line Manuals
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
Appendix
Macro Operators
Three preprocessor operators may be used in #define or #if and #elif preprocessor directives. They are:
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