Static Data Member

 A data member of a class can be qualified as statics. The properties of a static member variable are similar to that of a C static variable. A static member variable has certain special characteristics. These are:

• It is initialized to zero when the first object of its class is created. No other initialization is permitted.
• Only one copy of that member is created for the entire class and is shared by all the objectives of that class, no matter how many objects are created.
• It is visible only within the class, but its lifetime is the entire program.

#include <iostream>

using namespace std;

class item

{

       static int count;

       int number;

       public:

       void getdata(int a)

       {

           number=a;

           count ++;

       }

       void getcount(void)

       {

           cout<< "count";

           cout<< count <<"\n";

       }

};

int item::count;

int main()

{

        item a,b,c;

        a.getcount();

        b.getcount();

        c.getcount();

        

        a.getdata(100);

        b.getdata(200);

        c.getdata(300);

        

        cout<<"After reading data" << "\n";

        

        a.getcount();

        b.getcount();

        c.getcount();

        return 0;

}