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This video tutorial covers the if defined and if not defined preprocessor directives in C, which are used for conditional compilation. These directives allow us to include or exclude pieces of code in our source code based on whether a macro has been defined or not. The preprocessor is often used to create constants using the define statement. During compilation, a text substitution operation takes place in the pre-processing phase where occurrences of macros are replaced with their defined values. For example, if we define a macro called buffer size as 100, any instance of buffer size in the code will be replaced with 100 during compilation.
