6.3 Preprocessor -- 1

6.3 Preprocessor -- 1

• Start with # end with \n
• Can be extended with \\n at end of line
• Macros - text replacement
  #define identifier token-sequence
  identifier often upper-case
• File inclusion
  #include "filename" -- user files
  /usr/include
  #include <filename> -- system files
• Conditional compilation

    #if constant-expression
    #ifdef identifier
    #ifndef identifier
    #elif  constant-expression
    #else
    #endif
    function defined
    operator !
    

• Predefined names  

    __LINE__
    __FILE__
    

6.3 Preprocessor -- 1