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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. const int DAYS = 0x08;
  6.  
  7. class Date
  8. {
  9. private:
  10. 	uint8_t day, month, year;
  11.  
  12. public:
  13. 	Date():day(1), month(1), year(00)  {} // Initialisierungsliste mit konstante Parameterwerten
  14. 	// Initialisierungsliste ueber parametrisierten Konstruktor
  15. 	Date(uint8_t _day, uint8_t _month, uint8_t _year):day(_day), month(_month), year(_year) {}
  16.  
  17.     uint8_t GetDay();		// Methode
  18.     virtual string GetDay(string where); 
  19. };
  20.  
  21. string Date::GetDay(string where)
  22. {
  23.     //day = "Datestr " + toString(value);
  24.     string day = where + " In Date Day: " + to_string(GetDay());
  25.     return day;
  26. }
  27.  
  28. uint8_t Date::GetDay()
  29. {
  30.     return day;
  31. }
  32.  
  33. class DateString : public Date
  34. {
  35. public:
  36.     DateString():Date() {}
  37.     DateString(uint8_t _day, uint8_t _month, uint8_t _year): Date(_day, _month, _year) {}
  38.  
  39. 	int GetDay() { return 10; }
  40. 	int GetDay(int xy) { return 99; }  
  41. 	virtual string GetDay(string where);
  42. };
  43.  
  44. string DateString::GetDay(string where)
  45. {
  46.     //day = "Datestr " + toString(value);
  47.     string day = where + " In DateString Day: " + to_string(GetDay());
  48.     return day;
  49. }
  50.  
  51. int main()
  52. {
  53.     Date *pBoth;
  54.     DateString ds;
  55.     Date d;
  56.     pBoth = &d;     // Mit new wird Speicher wird auf dem Heap reserviert
  57.  
  58. // löschen Sie virtual vor der Deklaration. Wann und was ändert sich am Ergebnis?
  59.  
  60.     pBoth = &d;
  61.     cout << pBoth->GetDay("Where am I?") << endl;  // Virtuelle Methode GetDay return 1
  62.     pBoth = &ds;
  63.     cout << pBoth->GetDay("Where am I?") << endl;  // Virtuelle Methode GetDay  return 10;
  64. }
  65.  
Success #stdin #stdout 0s 3232KB
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stdin
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Standard input is empty
stdout
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Where am I? In Date Day: 1
Where am I? In DateString Day: 10
https://ideone.com/sHCtBz
Virtuelle Methoden
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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