Thread: the role of preprocessor directives in c program

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    the role of preprocessor directives in c program

    What is the role of preprocessor directives in c program? What if, we don't use it?

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    Preprocessor is a part of <<snipped spammy URL>> and are executed before compilation. This is a macro processor, which is used automatically by the C compiler to transform your program before actual compilation.


    In simple words, preprocessor directives tells the compiler to preprocess the source code before compiling. All the preprocessor commands are begin with "#" symbol.


    The most common use of the preprocessor is to include header files. In C and C++, all symbols must be declared in a file before they can used. They don’t always need to be defined*, but the compiler needs to know they exist somewhere. A preprocessor is just another technique to help a programming language be more useful. There are numerous techniques available and every language designer must choose the ones they like.

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