What is the Basic structure of C Program?

1. Documentation Section: It increases Program Readability and Includes Comments to tell what the Program actually is.
2. Link Section: It Includes the Linkage details of program with ‘C‘ Standard Library Functions and Definition. It basically includes macros such as #include, #define, etc. 
3. Global Declaration Section: It Includes Global Variables which are used throughout the Program and its Subprograms /Subsections for keeping data values. It also Includes Function Declaration Statements.
4. Main Program Section: It Includes the Main Section which Starts from the Keyword Main and end with the symbol ‘}‘.
   

   Example:

   main()

   {

     Local declarative part

     executable statements

   }

5. Subroutine Section: This Section contains the details and Definitions of Subroutines/Functions Declared in the Global Declaration Section. There can be one or many functions in one program, but the main function is only one in one program.
   

   Function 1

   Function 2

   .

   .

   .

   Function n