|C - PROGRAMMING

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C PROGRAMMING – Programming 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:

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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.

Syntax:

Example:

/* Basic c- program structure */

Link section:

The link section provides instructions to the compiler to link

functions from the system library.

Syntax:

Common header files are

stdio- standard input /output function

conio- console input/output function

/*Multiple line comment */

// single line comment

#include <header file name.h>

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math-contains math function like (cos(),sin(),sqrt(),abs()).

Example:

#include <stdio.h>

#include<conio.h>

Definition section:

In this definition section we can defines all symbolic constants.

Syntax:

Example:

#define pi 3.142

Global declaration section:

The global variable 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.

Syntax:

Example:

int x=10;

# define symbolic-name constant-value

Datatype variable name = value;

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main () function section:

Every C-Program must have one main() function section and the

main function is divided into two parts they are

Declaration part

Executable part

Declaration part:

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

the executable part.

Syntax:

Example:

string x=”Wikitechy”;

Executable part

In this executable part section, the execution begins at the opening

brace and ends at the closing brace.

{ //Opening Brace

………

}; //Closing Brace

Datatype variable name = value;

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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.

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()

{

………

}