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

Write a c program to input five numbers, Write a C program to input five nu...

Write a C program to input five numbers and print them out on a new line e.g 5, 10, 15, 20, 25 displayed as   5   10   15   20   25 #include stdio.h   void main()   {

Program, First line starts with T, number of test cases. Each test case T c...

First line starts with T, number of test cases. Each test case T contains a necklace (N).

Exceptions handling in cpp, Exceptions. Your SVector class should throw fou...

Exceptions. Your SVector class should throw four exceptions: 3.1. If the constructor size is invalid, then it will just allow the implicit STL bad_alloc exception to pass up to mai

Friend funtion.., Is friend function can be harmfull to make a secure progr...

Is friend function can be harmfull to make a secure program/sofware?

What is the value of a resistor marked as 47kk, (a) Verify the values of th...

(a) Verify the values of the resistors with the following colour coding: (i) red-red-orange-silver (ii) orange-orange-black-blue-green (b) What is the value of a resistor

All topics in c, Give practice in writing program''s..

Give practice in writing program''s..

Class booking system, I want source code for class booking system by using ...

I want source code for class booking system by using C++ Programming...Urgent

C program to create a file student.dat, Program is to create a file student...

Program is to create a file student.dat: Program is to create a file student.dat which contains all name, roll_no,marks(5 sub) and percentage   class student    {

Explain mixed mode expressions and implicit type conversions, Mixed Mode Ex...

Mixed Mode Expressions and Implicit type Conversions A mixed mode expression is one in which the operands are not of the similar type. In this case, the operands are converted

Stack push pop, 2 flowcharts, pseudocode for each (at least 4 algorithms), ...

2 flowcharts, pseudocode for each (at least 4 algorithms), and code for either a stack or a queuestion..

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