Virtual function and two subclasses : virtual function « Class « C++

1. C++
2. Class
3. virtual function

Virtual function and two subclasses

  
#include <iostream>  
using namespace std;

class Base {  
public:  
  virtual void who(void) {  
    cout << "Base\n";  
  }  
};  
     
class first_d : public Base {  
public:  
  void who(void) {  
    cout << "First derivation\n";  
  }  
};  
     
class second_d : public Base {  
// who() not defined  
};  
     
main(void)  
{  
  Base base_obj;  
  Base *p;  
  first_d first_obj;  
  second_d second_obj;  
     
  p = &base_obj;  
  p->who(); 
     
  p = &first_obj;  
  p->who();   
     
  p = &second_obj;  
  p->who();  
     
  return 0;  
}
  
    
  

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