c programming preprocessor #if

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Last Minute C Programming Preprocessor Directives Tutorial

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A Preprocessor in a C programming language is a Program that processes source code of a C program, expanding Macro Definitions, File Inclusions and more.

Only through Preprocessor directives, you are able to include library files in your C program.

Preprocessing in C happens before compilation. Part of the Source code is replaced with Preprocessing expressions where ever encountered. So the size of Total code increases before passing to the Compiler.

 

 

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