Structures of C-Language

 The structure of the C-Program are like as-

1). Documentation Section

2). Link Section

3). Definition Section

4). Global Declaration Section

5). main() function section 

   i). Declaration Part

  ii). Execution Part

6). Sub-program Section

   (User defined function)

Example:-

/* Calculating Area of Circle */.  <==Documentation section

#include<stdio.h>                       // Link Section

#define pi 3.14                            // definition Section

int main ( )                                   //main function Section

{

   float r, area;                              // Declaration Part

  printf("Input radius=");           // Execution Part

 scanf("%d",&r);

 area= pi*r*r;

 printf ("Area of Circle= %f",area);

 return 0;

}