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 about the string constants in c language, Explain about the String ...

Explain about the String Constants in c language? A collection of characters included within a pair of double quotes is treated as string constant. The character may be numbers

C program for dynamic data structure(linked list), Aim: To implement a pro...

Aim: To implement a program for dynamic data structure(linked list). Code:                       class node {             int data;             node *next;

The use of the break and continue statements in a loop, Question: (a) ...

Question: (a) A bank has four types of accounts with annual interest rates as follows: Savings 8% Savings with Cheque Book 5% Current 4% Fixed deposits 10% Using

Can you think of a condition where your program would crash , Can you think...

Can you think of a condition where your program would crash without attaining the breakpoint that you set at the starting of main()? A: C++ let for dynamic initialization of glo

Computes the ackermann-peter a m-n function, (a) Write a procedure that com...

(a) Write a procedure that computes the Ackermann-Peter a(m,n) function. (b) Write a helper procedure that only allows the calculation of the Ackermann-Peter function for 0≤m

String, A string is said to be "Beautiful"€, if it contains only non repet...

A string is said to be "Beautiful"€, if it contains only non repetitive alphabets

Program for game of war, Objective of this Program: (a) To learn more ab...

Objective of this Program: (a) To learn more about modularization of a program into independent modules, (b) To use arrays in a program, (c) To get some experience with us

Explain the loop statements in computer programming, Explain the Loop State...

Explain the Loop Statements in Computer Programming? 1. C gives you a choice of three kinds of loop, while, do while and for. 2. The while loop remain repeating an action until

Described container class?explain types of container class, A container cla...

A container class is a class which is used to hold objects in external storage and memory. A container class work as a generic holder. A container class contains a predefined behav

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