Preprocessor

Preprocessor

Topics Covered

• #include and header search paths
• #define for constants and macros
• Macros with arguments and variadic macros
• Macro pitfalls: side effects, operator precedence
• Conditional compilation: #if, #ifdef, #ifndef, #elif, #else, #endif
• Include guards and #pragma once
• Predefined macros (FILE, LINE, func)
• Stringification (#) and token pasting (##)

Content coming soon. This module will cover the C preprocessor — a text-substitution engine that runs before compilation. It covers macros, conditional compilation, and the subtle bugs that macros can introduce.