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

C program for palindrome, C Program for Palindrome Norm...

C Program for Palindrome Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Need a solution, Hello. I need a solution for this assignment. It is for C+...

Hello. I need a solution for this assignment. It is for C++ Language: Create a BusinessPartner class that contains a first name, company name, and a telephone number. Create a Con

Produce an executable file, Requirements Create a "makefile" that w...

Requirements Create a "makefile" that will manage the construction of a program The name of the makefile must be: makefile The make file must produce an executable

Gross pay, Develop a C++ program that uses a while to determine the gross p...

Develop a C++ program that uses a while to determine the gross pay (in Dollars) for each of several employees. The company pays “straight-time” for the first 40 hours worked by eac

Write a program to calculate the average of ten numbers, Write a program to...

Write a program to calculate the average of ten numbers       #include stdio.h     /* Only this header is needed since only IO are used */     void main()     {          char

Programing, Define a structure to store roll no, name and marks of a studen...

Define a structure to store roll no, name and marks of a student. b) Using the structure of Q2. a), above write a ''C'' program to create a file "student.dat". There must be one r

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

#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 concatenation. For a string

Padovan string, write a C program for padovan string for a natural number

write a C program for padovan string for a natural number

What is the use of pear in php, What is the use of PEAR in php? PEAR is...

What is the use of PEAR in php? PEAR is termed as PHP Extension and Application Repository. It provides structured library to PHP users and also gives provision for package mai

Help, what is c++ ?

what is c++ ?

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