The #include directive in C is used to include the contents of a specified file into your program. This is typically used to include header files that contain declarations for functions and macros, allowing you to use them in your code.
Purpose:
- Function Declarations: It provides the necessary declarations for functions that are defined in the included file, enabling you to call those functions in your program.
- Constants and Macros: It can include constants and macros that can be used throughout your code.
- Code Reusability: It promotes code reusability by allowing you to use common functions and definitions across multiple files.
For example, #include <stdio.h> includes the standard input-output library, which allows you to use functions like printf and scanf.
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