Introduction of Static Member

 

Static Member

Static variable

Static variable are initialized to zero before the first object created.

Only one copy of static variable exist for a whole program.

All object share one copy of static variable.

It will remain in the memory till end of the program.

 

Static function

A static function may be called by itself without depending on any object

To access a static function we used,

classname::staticfuction();

 

Example:

#include <iostream>
using namespace std;
 
class statx{
    private:
    int x;
    public:
//here static variable initiate
    static int sum;
//here constructor create
    statx(){
        x=sum++;
    }
//here static function initiate
    static void stat(){
        cout<<"result is "<<sum<<"\n";
    }
    void number(){
        cout<<"Number is: "<<x<<"\n";
    }
};
//here static variable initiate globally
int statx::sum;

int main()
{
   statx o1,o2,o3,o4;
   o1.number();
   o2.number();
   o3.number();
   o4.number();
//here static access without depending on object
   statx::stat();
//here static variable print
   cout<<"static var sum "<<o1.sum;
   return 0;
}