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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class base{
  5. 	public:
  6. 	int b;
  7. 	void Print_b(){
  8. 		cout<<b<<endl;
  9. 	}
  10. };
  11.  
  12. class derived: public base{
  13. 	public:
  14. 	int d;
  15. 	void Print_d(){
  16. 		cout<<d<<endl;
  17. 	}
  18. };
  19. int main() {
  20. 	// your code goes here
  21. 	base b1;
  22. 	b1.b = 1;
  23. 	b1.Print_b();
  24.  
  25. 	derived d1;
  26. 	d1.d = 2;
  27. 	d1.Print_b();
  28.  
  29. 	d1.Print_d();
  30. 	cout<<"via pointers\n";
  31.  
  32. 	derived * bptr = &d1;
  33. 	bptr->Print_b();
  34.  
  35. 	bptr = & b1;
  36. 	bptr->Print_b();
  37. 	bptr->Print_d();
  38.  
  39. 	base * dptr = &d1;
  40. 	dptr->Print_b();
  41.  
  42.  
  43. 	return 0;
  44. }
  45.  
  46.  
  47.  
  48.  
  49.  
  50.  
  51.  
  52.  
Compilation error #stdin compilation error #stdout 0s 3340KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:35:7: error: invalid conversion from ‘base*’ to ‘derived*’ [-fpermissive]
  bptr = & b1;
       ^
stdout
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Standard output is empty
https://ideone.com/MqEj6Y
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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