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C Academy · Lesson

Understanding the C Preprocessor

Learn how #include, #define, and #ifdef directives work.

1

Understanding the C Preprocessor

The C preprocessor is a tool that processes source code before compilation.

In this lesson, you will learn:

  • How the C preprocessor works.
  • How to use #include, #define, and #ifdef directives.
  • The role of preprocessor directives in modular programming.
Understanding the C Preprocessor — illustration 1

2

What is the C Preprocessor?

The C preprocessor modifies code before compilation by handling directives that start with #.

Common directives:

  • #include - Includes files.
  • #define - Defines macros.
  • #ifdef - Enables conditional compilation.

All lessons in this course

  1. Understanding the C Preprocessor
  2. Macros and Inline Functions
  3. Conditional Compilation
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