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

What is threaded binary tree, Threaded binary tree: Consider the linked il...

Threaded binary tree: Consider the linked illustration of a binary tree 'T.  Approximately half of the entries is the pointer fields 'LEFT' and 'RIGHT' will have null elements. Th

#, YOU HAVE GIVEN THE MARKED UP PRICE OF 80% AND DISCOUNT PRICE OF 10% THEN...

YOU HAVE GIVEN THE MARKED UP PRICE OF 80% AND DISCOUNT PRICE OF 10% THEN FIND THE SELLING PRICE

#luminous jewel polishing necklace, Ask question # Byteland county is very ...

Ask question # Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particu

Coding, padovan series with words

padovan series with words

Program to find whether a number is odd or even, PROGRAM TO FIND WHETHER A ...

PROGRAM TO FIND WHETHER A NUMBER IS ODD OR EVEN int main() { int number ; printf("Enter a whole number\n"); scanf("%d",&number); if(number % 2 == 0) printf("n

Write a c program to input a floating point number, Step 1 Define the start...

Step 1 Define the start of the program    It should be noted that within C all commands should end in a semi-colon. For most of your programs the definition of a program header as

Input data analysis, Create a class Word, representing a word. Two words sh...

Create a class Word, representing a word. Two words should be considered equal if they consist of the same sequence of letters and we consider upper case and lower case as equal. F

Multiple constructor, Constructor public class ListNode {    //...

Constructor public class ListNode {    // package access members; List can access these directly private E data; // data for this node privateListNode nextNode; /

Differentiate between the expression ++a and a++, Differentiate between the...

Differentiate between the expression "++a" and "a++"? - With ++a, increment happens first on variable a, and resulting value is used. This is known as prefix increment. - Wi

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