Static Data Member in C++ with example

• Static Data Members are basically those members which are common to all objects of the class.
• Static members can be any one of the groups; private, protected, public, but not global data.
• The access principle of the data member of a class is same for the static data member also.
• When a static data member is declared and it has only a single copy, it will be shared by all the instance of the class.
• The static data member must be created and initialized before the main() function.

Note:-Static Variable [Default value = 0]

Example:

#include<iostream.h>

#include<conio.h>

class student

{

int id;

char name[20];

static int count;                               

public:

void get();

void put();

};

               int student :: count;

void student :: get();           

{

cout<<”Enter the Student Info = ”;

cin>>id>>name;

count ++;

}

void student :: put();

{

               cout<<”Student id = ”<<id;

               cout<<” Student name = ”<<name;

               cout<<” count = ”<<count;

}

void main()

{

clrscr();

student st, mt;

               st.get();

               mt.get();

               st.put();

               mt.put();

               getch();

}