C - Program Structure




C Program Structure

  • C - programming is the structure oriented Programming language in which the programs are compiled and run in a top down approach.

Basic Structure of C- Programming :

1. Documentation section :

  • The documentation section defines the set of comment lines (/* */) or ( // ). For example, it might be the name of the program or author and other details for feature reference we can define this section.
  • The Compiler ignore commands when compiling because commands only for the purposes of others understanding the codes.
  • Comment can be used anywhere in the program

C Syntax

/*Multiple line comment */
//single line comment ;

Programming Example :

/* Basic c- program structure */ 

2. Link section :

  • The link section provides instructions to the compiler to link functions from the system library.

C Syntax

#include<header file name.h>

3. Common header files are

  • The commands in these section are called preprocessor commands
  • stdio- standard input /output function
  • conio- console input/output function
  • math-contains math function like (cos(),sin(),sqrt(),abs()).

Programming Example :

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

Read Also

C Structure

4. Definition section :

  • In this definition section we can defines all symbolic constants.

C Syntax

# define symbolic-name constant-value 

Programming Example :

#define pi 3.142

5. Global declaration section :

  • The variables that are used in more than one function. Such variables are called global variables. And in general we can call the global variable outside the function.

C Syntax

Datatype variable name = value; 

Programming Example

int x=10; 

6. main () function section :

  • The main() is the main function where program execution begins.
  • Thats why every C-Program must have one main() function section and the main function is divided into two parts they are
    • Declaration part
    • Executable part

7. Declaration part :

  • In this declaration part we declare all the variables that are used in the executable part.

C Syntax

Datatype variable name = value;

Programming Example

string x=”Wikitechy”; 

8. Executable part :

  • In this executable part section, the execution begins at the opening brace and ends at the closing brace.
{      //Opening Brace
........
};     //Closing Brace
  • The closing brace of the main function is the logical end of the program. All statements in the declaration and executable part ends with a semicolon.

9. Subprogram section :

  • The subprogram section contains all the user-defined functions that are called in the main () function.
  • User-defined functions are generally placed immediately after the main () function, although they may appear in any order.
main()
{                            
………
function name();
}                             
	Subprogram function name()
{
………
}


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