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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. class C1 {
  6. public:
  7.     void f() { cout << "something" <<endl; }
  8. };
  9.  
  10. class C2 : public C1 {
  11. };
  12.  
  13. class C3 : public C2 {
  14. public:
  15.     void f() override { cout << "something else" <<endl; }
  16.  
  17. };
  18.  
  19. int main() {
  20. 	C1 c1;
  21.     C3 c3;
  22.     c1.f();
  23.     c3.f();
  24. 	return 0;
  25. }
Compilation error #stdin compilation error #stdout 0s 3096KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:15:10: error: 'void C3::f()' marked override, but does not override
     void f() override { cout << "something else" <<endl; }
          ^
stdout
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Standard output is empty
https://ideone.com/W6bMQZ
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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