Explain static class members, C/C++ Programming

Assignment Help:

Static Class Members

As we already know all the objects of the class have dissimilar data members but invoke the similar member functions. Though, there is an exception to this rule. If the data member is declared with the keyword static, then only one such data item is formed for the entire class, no matter how many objects it has. Static data members are useful, if all objects of a class must share a common data item. While, the visibility of this data item remains similar, the duration of this variable is for whole lifetime of the program.

For example, such a variable can be particularly useful if an object needs to know how many objects of its kind exist.

class counter

                 {

                  public :

                                                counter ();

                                                int getcount();

  private:

                                static int count;

                };

counter::counter ()

                 {

                count++;

                 }

 

int counter::getcount()

                {

                                return ( count );

                 }

 

     int counter :: count = 0;// INITIALIZATION OF STATIC MEMBER.

 

                void main()

                 {

                  counter c1,c2;

                                cout << " Count = " << c1.getcount() << endl;

                                cout << " Count = " << c2.getcount() << endl;

 

                  counter c3;

                                cout << " Count = " << c3.getcount() << endl;

                  counter c4,c5;

                                cout << " Count = " << c4.getcount() << endl;

                                cout << " Count = " << c5.getcount() << endl;

                  }

 

Output:

 

                Count = 2             // not 1 because 2 objects are already created.

                Count = 2

                Count = 3

                Count = 5

                Count = 5

 

 


Related Discussions:- Explain static class members

Law of motion, Ask question asdasasas#Minimum 100 words accepted#

Ask question asdasasas#Minimum 100 words accepted#

Asset pricing project, In the final project assignment you are asked to dev...

In the final project assignment you are asked to develop an OOP C++ class hierarchy for derivative pricing, using the binomial tree and Black-Scholes option pricing methods. You wi

Data structure, Project Description: Project is related indexing data re...

Project Description: Project is related indexing data related some data structure. I need to share all information related project later if i contact any body Skills required

Command line program to find name matches, What's a six-letter word that ha...

What's a six-letter word that has an e as its first, third, and fifth letter? Can you find an anagram of pine grave. Or how about a word that starts and ends with ant (other than a

Padovan string, write a C program for padovan string for a natural number

write a C program for padovan string for a natural number

Rfid call to filmmaker pro database, Project Description: I want an expe...

Project Description: I want an experienced programmer to program an RFID tag that will be read (maybe also written), and perform a call to a Filmmaker Pro 13 database. Skills

Binary search tree and graph, Important Note: No course works, which have b...

Important Note: No course works, which have been submitted via hard copies or emails, will be accepted a short essay below edited in a document (word, other) files with

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