Explain static member functions, C/C++ Programming

Assignment Help:

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 area in existence. Though, this function uses existing objects to invoke a member function getcount(), which returns the value of the static data member. What if the programme does not require to use objects to invoke this function and still the programme would like to know how many objects have been created? If there is no object how the member function is invoked? Further, as can be seen from the last output, the number of objects (count) remains similar at a given instance no matter which object is used to invoke the member function.  In fact, the use of existing objects, like in the above instance, is not an effective way to access the value of the static data member. A specific object should not be used to refer to this member, as it does not belong to that object; it belongs to the whole class. C++ gives a facility to define static function members, for the similar. That is, to invoke such a function, an object is not needed. It can be invoked with the name of the class. The programme given below illustrates its use.

 

                class counter

                 {

                  public :

                                                counter ();

                                                static int getcount();

 

                  private:

                                static int count;

                };

counter::counter ()

                 {

                                count++;

                 }

 

                int counter::getcount()

                 {

                                 }

 

int counter :: count = 0;        // INITIALIZATION OF  

                                    STATIC MEMBER.

void main()

                 {

                  counter c1,c2;

                                cout << " Count = " << counter :: getcount() << endl;

                                cout << " Count = " << counter :: getcount() << endl;

                  counter c3;

                cout << " Count = " << counter :: getcount() << endl;

 

                  counter c4,c5;

 

                                cout << " Count = " << counter :: getcount() << endl;

                                cout << " Count = " << counter :: getcount() << endl;

                  }

Output:

                Count = 2

                Count = 2

                Count = 3

                Count = 5

                Count = 5

 

 


Related Discussions:- Explain static member functions

Explain about the unions, Explain what are Unions? The Unions like as s...

Explain what are Unions? The Unions like as structures, contain members whose individual data types may perhaps differ from one another. Though the members that create a union

Define some features of static storage class in c program, Define some feat...

Define some features of static storage class in c program? The features of a variable defined to contain a static storage class are as follows. Storage - memory Default

How do one throw polymorphically?, How do one throw polymorphically?       ...

How do one throw polymorphically?               A: Sometimes people write code such as: class MyExceptionBase { }; class MyExceptionDerived : public MyExceptionBase { };

Need payment gateway integration expert, Need Payment Gateway Integration E...

Need Payment Gateway Integration Expert Project Description: I am seeking for expert payment gateway integration. You must have done or have experience with integrating me

Explain difference between early binding and late binding, What is the diff...

What is the difference between early binding and late binding? What are advantages of early binding? a.) Late binding refers to function calls which aren't resolved until run t

Explain the defination and declaration of union, Explain the Defination and...

Explain the Defination and Declaration of Union? Generally in terms the composition of a union may be defined as be as union tag { member 1; member 2; member m; }; Wh

Need programmer to program a flex pcb, Project Description: I want a per...

Project Description: I want a person who will be able to program a flex PCB for my device as i meet the person i will be able to describe all my needs Skills required are C P

Padovan string, A Padovan string P(n) for a natural number n is defined as:...

A Padovan string P(n) for a natural number n is defined as: P(0) = ‘X’ P(1) = ‘Y’ P(2) = ‘Z’ P(n) = P(n-2) + P(n-3), n>2

Input, I want to take 1.1 as input but when I am declaring it as float the ...

I want to take 1.1 as input but when I am declaring it as float the output is given as 1.1000000

What are the two steps that happen while i say delete p?, A: N delete p is ...

A: N delete p is a two-step procedure: it calls the destructor, and then releases the memory. The code developed for delete p is functionally similar to this (supposing p is of typ

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