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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class A{
  5. 	public:
  6. 	virtual void O(){
  7. 		cout <<"A"<<endl;	
  8. 	}
  9. };
  10.  
  11. class B : public A{
  12. 	virtual void O(){
  13. 		cout <<"B"<<endl;	
  14. 	}	
  15. };
  16.  
  17.  
  18. int main() {
  19. 	// your code goes here
  20. 	A a;
  21. 	B b;
  22. 	a.O();
  23. 	//b.O(); //error!
  24. 	A *ab = new B();
  25. 	ab->O();
  26. 	return 0;
  27. }
Success #stdin #stdout 0s 15240KB
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Standard input is empty
stdout
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A
B
https://ideone.com/DDQN8q
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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