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CARM User's Guide
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 Appendix#ifdef
The #ifdef directive is a special case of the #if directive that tests a name to determine if it is defined.
#ifdef name
This directive is equivalent to:
#if defined(name)
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