Define external storage class - computer programming, C/C++ Programming

Assignment Help:

Define External Storage Class - computer programming?

When a variable is declared outside a function the storage is permanently assigned to it and its storage class is 'extern' and a declaration for an external variable can look just the name as a local variable declaration. Such a variable is considered to be as global to all functions declared later than and upon exit from the function or block, the external variable remains in existence. These variables are able to be accessed by any function in the program.

Illustration is

extern int a=1, b=2;

The External variables never disappear because they exist throughout the execution life of the program and they can be used to transmit value across functions. They may be unseen if the identifier is redefined.

All the functions have external storage class. This signifies that the key word extern can be used in function prototypes and in function definitions. 


Related Discussions:- Define external storage class - computer programming

Write a simple telephone book program, Write a simple telephone book progra...

Write a simple telephone book program that stores the names and phone numbers of your friends/acquaintances in a file. Your program should have the abilities to: a. Add entries (n

Theory, recursive sub programs

recursive sub programs

C program to copy the contents of a file, C Program to copy the contents of...

C Program to copy the contents of a file: void main()    {   ifstream fin("input.txt");   ofstream fout("output.txt");   char ch;   while (fin)       {

Open and close ?les for writing, If you have computed a number (stored as a...

If you have computed a number (stored as a ?oating-point value) and want to display this on a plot (i.e. as a character string) you have to convert it into a STRING. That is we wan

Code for design software, In this project, you will write a software for th...

In this project, you will write a software for the Registrar's office of a university called YouOIT to maintain information about students and courses at the university. The reg

Generate a class node that contains an integer id, Generate a class node ...

Generate a class node that contains an integer id, a position (x, y)  and a vector of 0 5,  generate a set of  x nodes each with random connectivity n.    Implement an algorith

Data structyres, What data structure would you mostly likely see in a nonre...

What data structure would you mostly likely see in a nonrecursive implementation of a recursive algorithm?Minimum 100 words accepted#

What is the difference among a pointer and a reference?, A: A reference has...

A: A reference has to always refer to some object and, so, must always be initialized; pointers do not have such limits. A pointer may be reassigned to point to distinct objects wh

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd