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  1.  
  2.  
  3. #include <iostream>
  4. using namespace std;
  5. class B
  6. {
  7.     public:
  8.      virtual void display()      /* Virtual function */
  9.          { cout<<"Content of base class.\n"; }
  10. };
  11.  
  12. class D1 : public B
  13. {
  14.     public:
  15.        void display()
  16.          { cout<<"Content of first derived class.\n"; }
  17. };
  18.  
  19. class D2 : public B
  20. {
  21.     public:
  22.        void display()
  23.          { cout<<"Content of second derived class.\n"; }
  24. };
  25.  
  26. int main()
  27. {
  28.     B *b;
  29.     D1 d1;
  30.     D2 d2;
  31.  
  32. /* b->display();  // You cannot use this code here because the function of base class is virtual. */
  33.  
  34.     b = &d1;
  35.     b->display();   /* calls display() of class derived D1 */
  36.     b = &d2;           
  37.     b->display();   /* calls display() of class derived D2 */
  38.     return 0;
  39. }
Success #stdin #stdout 0s 3296KB
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Standard input is empty
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Content of first derived class.
Content of second derived class.
https://ideone.com/IuPiTT
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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