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

Mobile problem, program that decodes sending smuggler''s string

program that decodes sending smuggler''s string

Assignment, write a function rise to the power to find the exponent of a nu...

write a function rise to the power to find the exponent of a number whether function is called

Define the processing of a structure, Define the Processing of a Structure?...

Define the Processing of a Structure? The members of structure are typically processed individually as separate entities. So we must be able to access the individual structure

Program that implements a digital clock, Write C code for a program that im...

Write C code for a program that implements a digital clock (HH:MM:SS). The clock includes a two-digit hour indicator HH (00-23), a two-digit minute indicator MM (00-59), and a t

Develop diablo 2 lod 1.13d dupe method for closed battle.net, Develop Diabl...

Develop Diablo 2 LOD 1.13d Dupe Method for Closed Battle.net This hack is for diablo 2 lord of destruction The program must work on all realms, all cores, all ladders (4x rea

Assignment, write a c program chat illustrates the creation of child proces...

write a c program chat illustrates the creation of child process using fork system call. One process finds sum of even series and other process finds sum of odd series.

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; /

Converting base type to class type (char to string), Converting Base Type t...

Converting Base Type to Class Type (char to string)   class String { char *name; int length; public: String(void) {length =0; name = new char[length+1];

Decode the code, smugglers transfer the messages from one to another by usi...

smugglers transfer the messages from one to another by using the mobile

#padovan string in c, #write a program that counts the number of occurances...

#write a program that counts the number of occurances of the string in the n-th padovan string p(n)

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