type_casting.cpp
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	#include <iostream>
	class Animal {
	public:
	void scream() { std::cout << name << ": AAAAA\n"; }

	protected:
	std::string name;
	};

	class Cat : public Animal {
	public:
	void scream() { std::cout << name << ": MIAOU\n"; }
	};

	class Dog : public Animal {
	public:
	void scream() { std::cout << name << ": OUAFF\n"; }
	};

	void casting() {
	Cat c;
	Animal *ptr = &c;
	ptr->scream();
	}

	void makeItScream(Animal &a) {
	// do not know if 'a'
	// is Cat or Dog
	a.scream();
	}

	int main() {
	Cat c;
	makeItScream(c);
	}