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

Algorithm, Write algorithms to implement the insertion and deletion operati...

Write algorithms to implement the insertion and deletion operations.

Link list, For this program you will add and test 2 new member functions to...

For this program you will add and test 2 new member functions to the IntSLList class posted on the website. The two member functions are: insertByPosn(int el, int pos) Assuming t

Board coloring, in this problem you are given a board in which some of the ...

in this problem you are given a board in which some of the elements are placed as shown in below diagram.each element represent a color.fill the other element in the board,such tha

Basic data type in cpp, B a s i c D a t a t y p e : ...

B a s i c D a t a t y p e : T h e r e a r e t h r e e t y p e o f d a t a t y p e i n C+ + 1.       P r

Explain control flow, Control Flow The control flow statements are used...

Control Flow The control flow statements are used when it is needed that the flow of the program is to be changed after taking some decision. This control flow statement theref

Palindrome, string S convert it to a palindrome by doing chara, C/C++ Progr...

string S convert it to a palindrome by doing chara, C/C++ Programming

Define the c preprocessor, Define the C Preprocessor? Preprocessor' is ...

Define the C Preprocessor? Preprocessor' is a translation stage that is applied to your source code before the compiler proper gets its hands on it usually the preprocessor per

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