C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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Preprocessor Directives
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─────C/C++ Language─────────────────────────────────────────────────────────
 
   The following are directives to the preprocessor:
 
  #define     #endif      #ifdef      #line
  #elif       #error      #ifndef     #pragma
  #else       #if         #include    #undef
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