Understanding Inheritance in C++ [duplicate]

Question

I am trying to learn C++, and wrote this code. According to my understaing this code need to produce output as "Derived Class" but output is "Base Class". Please help me understand this.

#include <iostream> 
using namespace std; 

class Base { 
    public: 
    char* name; 
    void display() { 
         cout << name << endl; 
    } 

};

class Derived: public Base { 
   public: 
   char* name; 
   void display() { 
       cout << name << ", " << Base::name << endl; 
   } 
}; 

int main() { 
   Derived d; 
   d.name = "Derived Class"; 
   d.Base::name = "Base Class"; 

   Derived* dptr = &d; 

   Base* bptr = dptr; 

   bptr->display();
}

Please consider me as a beginner and explain why its output is "Base Class"

Answer 1

You need to make the display() method virtual

Like this:

class Base{ 
    public: 
    char* name; 
    virtual void display() { 
         cout << name << endl; 
 } 

virtual allows derived classes to 'override' the base class' functions.