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

Explain the bitwise-inclusive-or operator, Explain the Bitwise-Inclusive-OR...

Explain the Bitwise-Inclusive-OR Operator: |? The bitwise-inclusive-OR operator (|) contrast each bit of its first operand to the corresponding bit of its second operand and if

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()                                 {

Explain about the expressions in c language, Explain about the Expressions ...

Explain about the Expressions in c Language? An expression is the combination of constants, variables and operators arranged as per the syntax of the language. Some of the illu

Constructor , What is constructor or ctor? need help

What is constructor or ctor? need help

Is probable to encompass virtual constructor? if yes, Is it probable to enc...

Is it probable to encompass Virtual Constructor? If yes, how? If not, Why?

Subrotine assembly language, You have to write a subroutine (assembly langu...

You have to write a subroutine (assembly language code using NASM) for the following equation.

Quicksorting in linked lists, How do i write a code in C++ to bubblesort in...

How do i write a code in C++ to bubblesort in linked list

Volume, how to find the volume of cone , cylinder and sphere ?

how to find the volume of cone , cylinder and sphere ?

I need vsti program, I need vsti program Project Description: Knowled...

I need vsti program Project Description: Knowledge of vsti programs, and music is a plus, ex: nexus I will input the sounds I just need the interface built Skills required

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