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C++多态性程序例子

#include <iostream.h>

class A
{
public:
	A() {}
	virtual void f() { cout<<"A::f() called.\n"; }
};

class B : public A
{
public:
	B() { f(); }
	void g() { f(); }
};

class C : public B
{
public:
	C() {}
	virtual void f() { cout<<"C::f() called.\n"; }
};

void main()
{
	C c;
	c.g();
}