305.cpp

C++实训教程

/*
	305.CPP
	了解继承关系
	CopyRight by Feng.2003/10, 1997/10
*/
#include<iostream.h>
class B
{
	private:   int b0;
	protected: int b1;
	public:
		int b;
		B (int n){	b0=n;b1=n+1;b=n+2;}
		void Disp()
      	{cout << "b0=" <<b0<<"b1="<<b1<<"b=" <<b<<endl;}
};

class D : public B
{
	private:     int d0;
	protected:   int d1;
	public:
		D (int n,int n1):B(n)
		{ d0=b1; d1=n1;}   //May Access b1
};

main(void)
{
	B b(100);
	cout<<"b.b=" <<b.b<<endl;
    //b.b1 = 10;  错！不能访问

	D d(2,22);
	cout << (d.b=1000);//public member of B are public in D
	return 0;
}
/* *
b.b=102
1000

*/