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

Algorithm, for different operation multiple stack

for different operation multiple stack

Palindrome, A palindrome is a string that reads the same from both the ends...

A palindrome is a string that reads the same from both the ends. Given a string S convert it to a palindrome by doing character replacement. Your task is to convert S to palindrome

Cange to palindrome, A palindrome is a string that reads the same from the ...

A palindrome is a string that reads the same from the both the ends. Given a string S convert it to a palindrome by doing character replacement. Your takes is to convert S to palin

Write program.., # Dear I want help to programmer that write C++ code for...

# Dear I want help to programmer that write C++ code for my small project as soon as posible If we can help me?..

Pointers, In this sub-task will you implement three functions for the final...

In this sub-task will you implement three functions for the final three function prototypes that will do exactly the same as the three functions that you have just written. This ti

Explain the new and delete operators, The new and delete operators The ...

The new and delete operators The C language has explained library functions- malloc() and free() for dynamic allocation and de-allocation of memory. C++ gives yet another appro

Destruction of array object, What's the order that objects in an array are ...

What's the order that objects in an array are destructed? Need assistance please explain it with example.

Minimization and karnaugh maps, There are formal ways of reducing Boolean e...

There are formal ways of reducing Boolean expressions in order to minimize the logic circuit. The two elementary ways of minimization are using Boolean expressions/De Morgan Theore

Padovan string ., #questio#A Padovan string P(n) for a natural number n is ...

#questio#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 where + denotes string concate

Array of objects, Array of Objects: The objects can be declared just li...

Array of Objects: The objects can be declared just like a structure or even a primary data type.  Array of objects may be required to work with large set of data.   When the da

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