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

Need cron job parsing json from api, Need Cron Job Parsing JSON from API, I...

Need Cron Job Parsing JSON from API, Inserting in to DB Project Description: The Project is to prepare a Cron Job with an adjustable interval in seconds and milli seconds. Cr

Read writers problem, Readers Writers with Processes and Threads Write two ...

Readers Writers with Processes and Threads Write two programs implementing ``reader pritority readers-writers synchronization'''' on files. One program will use processes, created

Object Oriented Programming, Ask queCreate an object oriented application w...

Ask queCreate an object oriented application with C# that computes the area of a rectangle, and the area and the volume of a cuboid. Based on the inheritance concept, create a bas

Develop a biomedical imaging project, Develop a biomedical imaging project ...

Develop a biomedical imaging project Project Description: This is a biomedical imaging project. Skills required are C++ Programming, Cocoa, Mac OS, Objective C

Explain static member functions, Static Member Functions All the object...

Static Member Functions All the objects of the class share static data members of a class. The example above demonstrates how to keep track of all the objects of a class which

Identifier and constant, What are  Id e n t i f ie rs a n d C o...

What are  Id e n t i f ie rs a n d C o n s t a n ts in C++? Id e n t i f ie r a n d C o n s t a n t : I d e n t i f ie r

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

Ask question asdasasas#Minimum 100 words accepted#

Finnishing C++ Project, i havea a small C++ i need help with. should not be...

i havea a small C++ i need help with. should not be anything special for an experienced programmer

Area under curve., find the c program to find area under the curvey=f(x) ...

find the c program to find area under the curvey=f(x)   #include float start_point, /* GLOBAL VARIABLES */ end_point, total_area;

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