tut52.cpp

#include<iostream>
using namespace std;

class BaseClass{
    public:
        int var_base=1;
        virtual void display(){
            cout<<"1 Dispalying Base class variable var_base "<<var_base<<endl;
        }
};

class DerivedClass : public BaseClass{
    public:
            int var_derived=2;
            void display(){
                cout<<"2 Dispalying Base class variable var_base "<<var_base<<endl;
                cout<<"2 Dispalying Derived class variable var_derived "<<var_derived<<endl;
            }
};
int main(){
    BaseClass *baseclass_ptr;
    BaseClass obj_base;
    DerivedClass obj_der;
    baseclass_ptr = &obj_der;
    baseclass_ptr->display();
    return 0;
}