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

''c'' programme, Write a ''C'' program to accept any 3 digit integer number...

Write a ''C'' program to accept any 3 digit integer number from the keyboard and display the word equivalent representation of the given number.

Define the int data type of c language, Define the Int Data Type of C Langu...

Define the Int Data Type of C Language? The int is used to define integer numbers. The Integers are whole numbers with a range of values supported by a particular machine and t

Stack, c++ program to to implement multiple stacks using single array

c++ program to to implement multiple stacks using single array

Variables within c, Within software languages we have the ability to store ...

Within software languages we have the ability to store information in mail boxes i.e. memory slots which are given names to represent the box. The naming rules are governed by the

Verifone pos offline mod vx670, Verifone pos offline mod vx670 Project D...

Verifone pos offline mod vx670 Project Description: I want a programmer who will build custom application for Offline VX670 to collect and save info+pin 1) Press the am

Is always the default constructor for fred fred::fred()?, Is always the def...

Is always the default constructor for Fred Fred::Fred()?

We need to decompile ex4 to mq4, We need to Decompile ex4 to mq4 I have ...

We need to Decompile ex4 to mq4 I have three expert advisors for mt4, which I need to decompile to its original mq4 code. Skills required are C Programming, C++ Programming,

Stack over flow for sun sparc, Please use C or C++ to write your programs. ...

Please use C or C++ to write your programs. Our homework will focus on SUN sparc machines because to exploit x86 stack-overflow is too easy. This is not just a programming assignme

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