Learn and Master C Programming - Understanding Conditional Compilation

This lecture covers conditional compilation in C, focusing on preprocessor directives like hash if, defined, and not defined macros. It explains how these directives allow for different code execution based on compilation parameters, useful for targeting various platforms or hardware. The lecture also discusses legacy directives like ifdef and ifndef, recommending modern alternatives for new code. Examples illustrate the practical application of these directives, emphasizing their role in managing code for different environments.

What is the significance of using 'hash if' statements in C?

Discuss how legacy code might use 'fdef' and its relevance today.

Provide an example of how to use 'if not defined' in a practical scenario.