Answer to Question #269167 in C++ for kool

Question

Q1:Define a class ABC. Derive two classes BBC and KBC from ABC. All the classes contains same

member function name as display(). The base class pointer always holds the derived class objects.

a) Write a program such that base class pointer or reference will always access/call the base version

of the members available in derived class, do not have any access to the derived class members.

b) Write a program such that base class pointer or reference will always access/call the derived

version of the members available in derived class, do not have any access to the base class

members.

Answer 1

a)

#include <iostream>
using namespace std;
class ABC{
    public:
    void display(){
        cout<<"class ABC\n";
    }
};
class BBC: public ABC{
    public:
    void display(){
        cout<<"class BBC\n";
    }
};
class KBC: public ABC{
    public:
    void display(){
        cout<<"Class KBC\n";
    }
};
int main(){
    ABC *ptr;
    KBC kbc;
    BBC bbc;


    ptr = &kbc;
    ptr->display();
    
    ptr = &bbc;
    ptr->display();
    
    return 0;
}

b)

#include <iostream>
using namespace std;
class ABC{
    public:
    virtual void display(){
        cout<<"class ABC\n";
    }
};
class BBC: public ABC{
    public:
    void display(){
        cout<<"class BBC\n";
    }
};
class KBC: public ABC{
    public:
    void display(){
        cout<<"Class KBC\n";
    }
};
int main(){
    ABC *ptr;
    KBC kbc;
    BBC bbc;


    ptr = &kbc;
    ptr->display();
    
    ptr = &bbc;
    ptr->display();


    return 0;
}