The Basic Structure of a C Program

1. Documentation Section: This consists of comments (e.g., /* ... */ or //) describing the program's purpose, author, and date.

2. Link Section (Preprocessor Directives): This tells the compiler to include necessary header files. For example, #include <stdio.h> is required for input/output functions.

3. Definition Section: Used to define symbolic constants (e.g., #define PI 3.14).

4. Global Declaration Section: Variables declared here can be accessed by any function in the entire program.

5. Main Function Section: Every C program must have a main() function. This is where the execution starts. It typically contains:

   • Declaration part: Declaring local variables.

   • Executable part: The actual logic/statements.

6. Subprogram Section: Contains user-defined functions that are called from the main() function.