Simple Structure Of C Program

Simple Structure Of C Program.

A C program is divided into different sections. There are six main sections to a basic c program.

The six Sections Are:

  • Documentation
  • Link
  • Definition
  • Global Declarations
  • Main functions
  • Subprograms

So now that the introduction is out of the way, let us jump to the main discussion. The whole code follows this outline. Each code has a similar outline. Now let us learn about each of this layer in detail.

Basic Structure Of A C Program | C Programming | Edureka

 

Documentation Section :-

The documentation section is the part of the program where the programmer gives the details associated with the program. He usually gives the name of the program, the details of the author and other details like the time of coding and description. It gives anyone reading the code the overview of the code.

Example :-

/*
Name: circleArea.c
Author: Pandey
Date: 28/02/22 08:27
Description: this program helps to find area of circle
*/

 

Link Section :-

This part of the code is used to declare all the header files that will be used in the program. This leads to the compiler being told to link the header files to the system libraries.

Example :-

#include<stdio.h>
#include<conio.h>

Definition Section :-

In this section, we define different constants. The keyword define is used in this part.

Example :-
#define PI=3.14

Global Declaration Section :-

This part of the code is the part where the global variables are declared. All the global variable used are declared in this part. The user-defined functions are also declared in this part of the code.

Example :-
float area(float r);
int a=5;

Main Function Section :-

Every C-programs needs to have the main function. Each main function contains 2 parts. A declaration part and an Execution part. The declaration part is the part where all the variables are declared. The execution part begins with the curly brackets and ends with the curly close bracket. Both the declaration and execution part are inside the curly braces.

Example :-
int main(void)
{
   int a=10;
   printf(" %d", a);
   return 0;
}

Sub Program Section :-

All the user-defined functions are defined in this section of the program.

Example :-

int add(int a, int b)
{
return a+b;
}

 

A Simple Program :-

 

/*
	Name: circleArea.c
	Author: Pandey
	Date: 28/02/22 08:27
	Description: this program helps to find area of circle 
*/
#include<stdio.h>
#define PI 3.14
float area(float r);//global declaration 
int main()//main function
{
float r;
printf(" Enter the radius:");
scanf("%f",&r);
printf("the area is: %f",area(r));
return 0;
}
float area(float r)
{
return PI * r * r;//sub program
}

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