a.cpp

it can help you use C++ program we

//测试a.h中定义的类
#include <iostream >
#include "a.h"
using namespace std;

void foo( A* obj)
{
	obj->Display();
}

int main()
{
	A	a;
	B	b;
	C	c;
	foo( &a );
	foo( &b );
	foo( &c );

	return 0;
}