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  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. class Pet
  7. {
  8. protected:
  9.     string type;
  10.     string name;
  11. public:
  12.     Pet(const string& arg1, const string& arg2);
  13.     virtual void whoAmI() const;
  14.     virtual string speak() const = 0;
  15. };
  16.  
  17. Pet::Pet(const string& arg1, const string& arg2): type(arg1), name(arg2)
  18.  
  19.  
  20. {}
  21. void Pet::whoAmI() const
  22. {
  23.     cout << "I am an excellent " << type << " and you may refer to me as " << name << endl;
  24. }
  25.  
  26. class Dog : public Pet
  27. {
  28. public:
  29.     using Pet::Pet;
  30.     void whoAmI() const override { std::cout << "Dog::whoAmI\n";}  // override the describe() function
  31.     string speak() const override;
  32.  
  33. };
  34.  
  35. string Dog::speak() const
  36. {
  37.     return "Arf!";
  38. }
  39.  
  40. class Cat : public Pet
  41. {
  42. public:
  43.     using Pet::Pet;
  44.  
  45.     string speak() const override;
  46.     // Do not override the whoAmI() function
  47. };
  48.  
  49. string Cat::speak() const
  50. {
  51.     return "Meow!";
  52. }
  53.  
  54. ostream& operator<<(ostream& out, const Pet& p)
  55. {
  56.     p.whoAmI();
  57.     out << "I say " << p.speak();
  58.     return out;
  59. }
  60.  
  61. int main()
  62. {
  63.     Dog spot("dog","Spot");
  64.     Cat socks("cat","Socks");
  65.     Pet* ptr = &spot;
  66.     cout << *ptr << endl;
  67.     ptr = &socks;
  68.     cout << *ptr << endl;
  69. }
  70.  
Success #stdin #stdout 0s 4412KB
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Dog::whoAmI
I say Arf!
I am an excellent cat and you may refer to me as Socks
I say Meow!
https://ideone.com/GNDRPz
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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