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Static Data Member In C++

We can define class members static using static keyword. When we declare a member of a class as static it means no matter how many objects of the class are created, there is only one copy of the static member.

A static member is shared by all objects of the class. All static data is initialized to zero when the first object is created, if no other initialization is present.

Fig: Static Data Member In C++ 

Program:

#include<iostream.h>

#include<conio.h>

class MCA

{

private:

static int count;

public :

void getdata(int);

void putdata();

};

void MCA::getdata(int x)

{

count =x;

count x++;

}

void MCA :: putdata()

{

cout<< “count=”count;

}

int MCA::count

{

void main()

{

MCA a1;

a1.putdata();

a1.putdata();

a1.getdata(20);

a1.getdata(30);

a1.putdata();

a1.putdata();

getch();

}

Output:

Count=0 count=0

Count=30 count =30