Explain union, C/C++ Programming

Assignment Help:

Unions

A union is also like a structure, except that only single variable in the union is stored in the allocated memory at a time. It is a collection of mutually exclusive variables, which means all of its member variables share the similar physical storage and only one variable is explained at a time. The size of the union is equal to the largest member variables. A union is defined as follows :

                union tag

                 {

                                type memvar1;

                                type memvar2;

                                type memvar3;

                                :

                                :

                 };

 

A union variable of this data type can be declared as follows,

Union tag variable_name;

e.g.

                union utag

                 {

                                int num;

                                char ch;

                 };

                union tag filed;

The above union will have two bytes of storage allocated to it. The variable num can be accessed as field.sum and ch is accessed as field.ch. At any time, only one of these two variables,  can be referred to. Any change made to single variable affects another.

 


Related Discussions:- Explain union

Illustrate the function definition, Illustrate the Function Definition? ...

Illustrate the Function Definition? The C code that explains what a function does is called the function definition. A function definition has the following form Type fun

For loop, minimum of seven number

minimum of seven number

Write a program that predicts users age, Write a program that predicts user...

Write a program that predicts users age: Write a program that predicts users' age (0-128 years old) with at most 7 questions. The game starts with asking the user whether he/s

Convert afl amibroker to dll, Project Description: I need to convert AFL...

Project Description: I need to convert AFL code of Amibroker to DLL plugin to hide original formula, and also to protect the DLL and making it hardware locked. I need to wrap th

I want vlc pitch changing addon, I want VLC Pitch Changing Addon Project...

I want VLC Pitch Changing Addon Project Description: Required: Plugin to modify the pitch of running tracks in VLC without changing the speed. Skills required are C Progra

Explain pointers to objects, Pointers to Objects Passing and returning ...

Pointers to Objects Passing and returning of objects is, though, not very efficient since it includes passing and returning a copy of the data members. This problem can be elim

C program for bernoulli''s equation, i need a detailed c program to explain...

i need a detailed c program to explain the parameters of bernoulli''s equation..

Develop diablo 2 lod 1.13d dupe method for closed battle.net, Develop Diabl...

Develop Diablo 2 LOD 1.13d Dupe Method for Closed Battle.net This hack is for diablo 2 lord of destruction The program must work on all realms, all cores, all ladders (4x rea

Priority Queue, Ask question #Minimum 100 words acceptedEducational Objecti...

Ask question #Minimum 100 words acceptedEducational Objectives: After completing this assignment, the student should be able to accomplish the following: Apply generic algorithms i

Working a homework programming assignment in C++, I am working on a program...

I am working on a program that allows a player to play a game against the computer. In this game the player can only chose to draw 1, 2, or 3 toothpicks. How do I make restrictions

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