General Structure of a C Program

1. Documentation Section:-

• Here we can write a set of comment lines
• This includes Title of the Program, Author Name, Company Name, Date of Creation and Other details if any
• Data and summary of the program.

2. Link Section:-

• It is also called Header File Declaration or Include Section
• It Links compiler to functions from System Library (Links Library functions of C)

3. Definition Section:-

• Defines Symbolic Constants

E.g. #define PI 3.14

4. Global Declaration Section:-

• Declaring Global Variables – Variables that are accessed by one or more functions are called “Global Variable”
• Prototype declaration of C Functions
• May contain Function Definition

5. Main Function Section:-

• This is the Main Function of all C Programs - (main())
• The program begins from here.
• Main program starts from here

6. Sub Program Section:-

• It has all User-Defined Functions that are called in main ( ) function or other sub functions defined by the user.
• User-defined functions are generally placed immediately after main ( ) function.