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  1. #include <iostream>
  2.  
  3. // base class
  4. class Animal {
  5. public:
  6. 	virtual void talk() = 0; // we don't provide any implementation here
  7. 	virtual ~Animal() {} // destructor must be virtual
  8. };
  9.  
  10. // derived classes
  11. class Cat: public Animal {
  12. public:
  13. 	Cat()
  14. 	{
  15. 		std::cout << "I want Whiskas!" << std::endl;
  16. 	}
  17.  
  18. 	~Cat()
  19. 	{
  20. 		std::cout << "Meooooooouuuchhh!" << std::endl;
  21. 	}
  22.  
  23. 	void talk()
  24. 	{
  25. 		std::cout << "Meow!" << std::endl;
  26. 	}
  27. };
  28.  
  29. class Dog: public Animal {
  30. public:
  31. 	Dog()
  32. 	{
  33. 		std::cout << "I want Pedigree!" << std::endl;
  34. 	}
  35.  
  36. 	~Dog()
  37. 	{
  38. 		std::cout << "Woooooaaaaaaaaaargghhhh!" << std::endl;
  39. 	}
  40.  
  41. 	void talk()
  42. 	{
  43. 		std::cout << "Woof!" << std::endl;
  44. 	}
  45. };
  46.  
  47. class Human: public Animal {
  48. public:
  49. 	Human()
  50. 	{
  51. 		std::cout << "I want pizza!" << std::endl;
  52. 	}
  53.  
  54. 	~Human()
  55. 	{
  56. 		std::cout << "Yahooooowl!" << std::endl;
  57. 	}
  58.  
  59. 	void talk()
  60. 	{
  61. 		std::cout << "Hello!" << std::endl;
  62. 	}
  63. };
  64.  
  65. int main()
  66. {
  67. 	Animal *zoo[3];
  68.  
  69. 	zoo[0] = new Cat;
  70. 	zoo[1] = new Dog;
  71. 	zoo[2] = new Human;
  72.  
  73. 	zoo[0]->talk();
  74. 	zoo[1]->talk();
  75. 	zoo[2]->talk();
  76.  
  77. 	delete zoo[0];
  78. 	delete zoo[1];
  79. 	delete zoo[2];
  80. }
  81.  
Success #stdin #stdout 0.02s 2816KB
comments (?)
stdin
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Standard input is empty
stdout
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I want Whiskas!
I want Pedigree!
I want pizza!
Meow!
Woof!
Hello!
Meooooooouuuchhh!
Woooooaaaaaaaaaargghhhh!
Yahooooowl!
https://ideone.com/2exxa
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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