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Preprocessor Directives In C

This thread contains 1 reply, has 2 voices, and was last updated by Nitesh User Do not delete 1 year, 8 months ago.

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    • #52897

      What Are Preprocessor Directives In C?


    • #52902

      C Preprocessor directives:

      Before a C program is compiled in a compiler, the source code is prepared by a program called preprocessor. This procedure is called preprocessing.

      Commands utilized in preprocessor are called preprocessor directives and they start with “#” symbol

      Preprocessing directives are lines in your program that begin with ‘#’. The ‘#’ is trailed by an identifier that is the directive name. For instance, ‘#define’ is the directive that defines a macro. Whitespace is likewise permitted when the ‘#’. A preprocessing directive can’t be more than one line in typical conditions. Some directive names require arguments.

      Some List of preprocessor directives :

      #include
      #define
      #undef
      #ifdef
      #ifndef
      #if
      #else
      #elif
      #endif
      #error
      #pragma

      The Preprocessor forms the source program before it is passed to the compiler. The features that preprocessor offers are known as Preprocessor Directives.


      Regards,
      Nitesh Bavishiya

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