Page 100 - DCAP404 _Object Oriented Programming

Unit 5: Static Members

of using a static member is to declare the global data which should be updated while the Notes
program lives in memory.
When a static member is declared private, the non-member functions cannot access these
members. But a public static member can be accessed by any member of the class. The static data
member should be created and initialized before the main function control block begins.

For example, consider the class account as follows:
class account
{
private:
int acc _no;

static int balance; //static data declaration
public:
void disp(int acc _no);
void getinfo( );
};
The static variable balance is initialized outside main() as follows:
int account::balance = 0; //static data definition
Consider the following Program which demonstrates the use of static data member count. The
variable count is declared static in the class but initialized to 0 outside the class.
#include <iostream.h>
#include <conio.h>
class counter
{
private:
static int count;
public:
void disp();
};
int counter::count = 0;
void counter::disp()
{
count++
cout << “The present value of count is “ << count << “\n”;
}
main()
{
counter cntl ;
for(int i=0; i<5; i++)
cnt1.disp();
getche();
}

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