Structure of C Program

In this post i am sharing structure of C Program. Actually C Program structure divided in to several sections. They are

Structure of C program is as follow:

1)Documentation:

Consist of comment that gives description of  the program or programmer,problem
   Ex:
   /*Prog for addition of two no */

2)Link Section:
 
For  a compiler to link function from library function.
  Ex:
  #include<stdio.h>
  #include<conio.h>

3)Definition Section:
 
Define all symbolic constant.
   Ex:
   void()

4)Global Declaration Section:
   
For declaration of variable as global variable which can accessed by all function of a program.
     Ex:
     int x=10;

5)Main Function Section:
 
This the most important part of the program.It contain declaration part and execution part of program.
    Ex:
    main()
    {
     Printf("Hello World!");
    }

6)Sub Program Section:
 
This include user define function.This function are placed after the main function.
    Ex:
    void()
    {
      printf("value inside fun() %d",a);
     }

Example of C program:

1. /*Documentation Section: program to find the area of circle*/
2. #include<stdio.h>   /*link section*/
3. #include<conio.h>  /*link section*/
4. #define PI 3.14     /*definition section*/
5. float area;          /*global declaration  section*/
6. void main()
7. {
8. float r;                /*declaration part*/
9. printf("Enter the radius of the circle\n");   /*executable part starts here*/
10. scanf("%f",&r);
11. area=PI*r*r;
12. printf("Area of the circle=%f",area);
13. getch();
14. }