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

code, direction[] = {L,R,R,L,L,R,R,R,R,L,Z} length[]= {2,2,1,1,1,2,5,2,2,3...

direction[] = {L,R,R,L,L,R,R,R,R,L,Z} length[]= {2,2,1,1,1,2,5,2,2,3,1}

Prepare windows shell extension, Prepare Windows Shell Extension Project...

Prepare Windows Shell Extension Project Description: Skills required are C++ Programming, Windows Desktop, Windows API

Develop stocastic expert advisor, Project Description: Need to develop a...

Project Description: Need to develop an expert advisor base on sthocastic oscilator with my own setting.. Very basic touch line OB/OS only but on my setting n condition Skill

Define four facilities provided by c language preprocessor, Define Four Fac...

Define Four Facilities Provided by C Language Preprocessor? The C language preprocessor provides four separate facilities that you can use as you see fit:   Inclusion

Program to design list in c, Program to design list in c: Write a prog...

Program to design list in c: Write a program in c to insert the values in list void main() { int i=0; char a[20]; clrscr(); printf("Enter the line\n");

Explain about the expressions in c language, Explain about the Expressions ...

Explain about the Expressions in c Language? An expression is the combination of constants, variables and operators arranged as per the syntax of the language. Some of the illu

multithreaded server, Implement a multithreaded server that can be used as...

Implement a multithreaded server that can be used as a proxy server to access some designated file (say it reflects the proxy copy of two file1.txt, file2.txt). Now use a client to

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