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C++多态性程序例子

#include <iostream.h>

class A
{
public:
	virtual void act1();
	void act2() { act1(); }
};

void A::act1()
{
	cout<<"A::act1() called."<<endl;
}

class B : public A
{
public:
	void act1();
};

void B::act1()
{
	cout<<"B::act1() called."<<endl;
}

void main()
{
	B b;
	b.act2();
}