Static data members :-
1. Only a single copy of the Static data members are shared between Objects of the Class.2. Static data members are initialized using the data type Class-Name and Scope-Resolution Operator and data member-Name
3. The Static members are declared using “ static “ keyword.
4. The access rule of the data members of a class is same for the static data member also.
5. The Static Data Members should be created and initialized before the main function control block
begins.
6. Syntax :-
• For variables :- static data-type variable-name ;
#include <iostream.h>
#include<conio.h>
class sample
{
static int a; // declaration
public:
void incr( )
{ a=a+1; }
void putdata ( )
{ cout <<"a="<<a<<endl; }
};
int sample::a; //by default initialize with 0
void main ( )
{ sample x,y,z;
y. incr ();
z.putdata( );
}
Example:
#include<iostream.h>
#include<conio.h>
int g=10;
class sample
{
int a;
public :
static int b;
void show()
{
b++;
cout<<"\nb = "<<b;
}
}s1,s2;
int sample :: b;
class other
{ int c;
public:void value()
{ s1.b+=2;
cout<<"\n--b--="<<s1.b;
}
} o1,o2;
void main()
{ clrscr();
s1.show() ;
o1.value();
s2.show();
o1.value();
getch();
}
output:
b=1;
--b--=3
b=4
--b--=6