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  1. #include <iostream>
  2.  
  3. class A
  4. {
  5. public:
  6.     virtual void foo() = 0;
  7. };
  8.  
  9. class B : public A
  10. {
  11. public:
  12.     virtual void foo() = 0;
  13. };
  14.  
  15. void B::foo()
  16. {
  17.   std::cout << "I'm a B!" << std::endl;
  18. }
  19.  
  20. class C : public B
  21. {
  22. public:
  23.     virtual void foo();
  24. };
  25.  
  26. void C::foo()
  27. {
  28.   B::foo();
  29.   std::cout << "I'm a C!" << std::endl;
  30. }
  31.  
  32. int main() {
  33.     A *pa;
  34.     C c;
  35.  
  36.     pa = &c;
  37.     pa->foo();
  38.  
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0s 3096KB
comments (?)
stdin
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Standard input is empty
stdout
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I'm a B!
I'm a C!
https://ideone.com/yBjf3I
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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