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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 8 months, 2 weeks 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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