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

Determine the current flowing by resistor, For the circuit shown in Figure,...

For the circuit shown in Figure, verify the p.d. across resistor R3. If the total resistance of the circuit is 100Ω, verify the current flowing by resistor R1. Find also the

Create a programming system, Your task is to create a programming system fo...

Your task is to create a programming system for a ferry. The ferry transports passengers and vehicles (cars, busses, lorries and bicycles). The ferry has space for 200 passengers a

C program to string compression, C program to string compression: Writ...

C program to string compression: Write a program to define a sting and all operations on string. void main()                                 {

Source code, processing two jobs through 2 machine

processing two jobs through 2 machine

C CODING, HOW THE C PROGRAM CODING IMPLEMENTED DY ITSELF UNDERSTANDING . AL...

HOW THE C PROGRAM CODING IMPLEMENTED DY ITSELF UNDERSTANDING . ALSO HOW I CAN A BECOME A GOOD PROGRAMMER IN C WHAT I DO FOR GOOD PROGRAMMING ,TELL ME HOW C CODING DEVELOP DY ITSELF

Objects as function arguments, Objects as Function Arguments: In C prog...

Objects as Function Arguments: In C program there are several methods to define arguments, and in some case even a structure can be approved as an argument.  Similarly in C+

, print this pattern 1 01 101 010

print this pattern 1 01 101 0101

Expression in c++, expression and its types with example programs

expression and its types with example programs

Define bitwise-shift operators, Define Bitwise-Shift Operators? The shi...

Define Bitwise-Shift Operators? The shift operators perform suitable shift by operator on the right to the operator on the left. The right operator should be positive. The va

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