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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. class Top {
  6. protected:
  7.     int x;
  8. public:
  9.     Top(int n) { x = n; }
  10.     virtual ~Top() {} 
  11.     friend ostream& operator<<(ostream& os, const Top& t) {
  12.         return os << t.x;
  13.     }
  14. };
  15. class Left : virtual public Top {
  16. protected:
  17.     int y;
  18. public:
  19.     Left(int m, int n) : Top(m) { y = n; }
  20. };
  21. class Right : virtual public Top {
  22. protected:
  23.     int z;
  24. public:
  25.     Right(int m, int n) : Top(m) { z = n; }
  26. };
  27. class Bottom : public Left, public Right {
  28.     int w; 
  29. public:
  30.     Bottom(int i, int j, int k, int m): Top(i), Left(0, j), Right(0, k) { w = m; }
  31.     friend ostream& operator<<(ostream& os, const Bottom& b) {
  32.         return os << b.x << ',' << b.y << ',' << b.z<< ',' << b.w;
  33.     }
  34. };
  35. int main() {
  36.     Bottom b(1, 2, 3, 4);
  37.     cout << sizeof b << endl;
  38.     cout << b << endl;
  39.     cout << static_cast<void*>(&b) << endl;
  40.     Top* p = static_cast<Top*>(&b);
  41.     cout << *p << endl;
  42.     cout << p << endl;
  43.     cout << static_cast<void*>(p) << endl;
  44.     cout << dynamic_cast<void*>(p) << endl;
  45.     return 0;
  46. }
  47.  
Success #stdin #stdout 0s 3344KB
comments (?)
stdin
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Standard input is empty
stdout
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28
1,2,3,4
0xbfcce604
1
0xbfcce618
0xbfcce618
0xbfcce604
https://ideone.com/WoX5DI
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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