Technical Stuff

#include<iostream>
using namespace std;
class single
{
 private:
 static single *ptr;
 single()
 {
 }
 public:
 static single* getInstance();
};
single* single::getInstance()
{
 if(ptr==NULL)
 {
 ptr = new single();
 cout<<"creating the instance and address is "<<ptr<<endl;
 }
 else
 {
 cout<<"instance already created address is "<<ptr<<endl;
 return ptr;
 }
}
single* single::ptr=NULL; //initialising the static variable
int main()
{
 single *s,*ss,*sss;
 s=single::getInstance();
 ss=single::getInstance();
 sss=single::getInstance();
}