617.cpp

C++实训教程

/*
	617.CPP   
	demo 继承的constructors
	Written by Feng
*/
#include <iostream.h>
class B
{
	protected:   int b;
	public:
      B():b(0){}
		B (int x):b(x){}
};

class D : public B
{
	protected:   int d;
	public:
		D (int x,int y):d(y*10),B(x+d){}
		D (int x):d(++x),B(x=10*x)	{ }
       void Disp()
	   {cout << "  b=" <<b<< "  d="<<d<<endl;}
};

class E : public B
{
	protected:   int e;
	public:
		E (int x,int y):B(x+y*10),e(y*10){}
		E (int x):B(x=10*x),e(++x)	{ }
       void Disp()
	   {cout << "  b=" <<b<< "  e="<<e<<endl;}
};

main(void)
{

	D d1(1,3); d1.Disp();
	D d2(222);  d2.Disp();
	E e1(1,3); e1.Disp();
	E e2(222);  e2.Disp();
	return 0;
}
/*
 b=2  d=30
 b=2220  d=2221
 b=31  e=30
 b=2220  e=2221

*/