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Basic C Tutorial

Contents
What is C ?
History
Structure of C Program
Variables & Keywords
Constants
Data Types
Operators
Operators Precedence
Conditional Statements
if Statement
if else Statement
nested if else
switch case
Looping Statements
While loop
Do While loop
For loop
Break
Continue
Goto
Functions
Passing Value
Returning Value
Passing & Returning
Recursion
Storage Class
Array
Structure
Pointer
Union
Strings
Header File
Programs Library
Projects Library
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External Storage Class in C

Syntax :

	extern [data_type] [variable_name];
	
Example :

	extern int a;
	

The variable access time is very fast as compared to other storage classes. But few registers are available for user programs.

The variables of this class can be referred to as 'global or external variables.' They are declared outside the functions and can be invoked at anywhere in a program.

Program :

// Program to demonstrate external storage class
#include <stdio.h>
#include <conio.h>

extern int i=10;
int main(void)
{
	int i=20;
	void show(void);
	clrscr();
	printf("\n\t %d",i);
	show();
	getch();
	return 0;
}
void show(void)
{
	printf("\n\n\t %d",i);
}

Output :


	20

	10_

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Published on: 12th Nov 2010, Last Updated on: 18th Dec 2014

Mr. Dinesh Kudache
AUTHOR: Mr. Dinesh Kudache

Mr. Dinesh is the Founder and CEO of technoexam.com. He had 6+ years experience in Application Programming, System Programming, Web Design and Development, Google Expertise. He had written 5000+ various articles on programming. Browse more articles by this author.

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