8_5.cpp

来自「c++书籍的源代码」· C++ 代码 · 共 61 行

#include<iostream.h>
class A
{
 public:
  virtual void fun1(void);
};
void A::fun1(void)
{
  cout<<"A"<<endl;
}	
class B
{
 public:
  virtual void fun2(void);
};
void B::fun2(void)
{
  cout<<"B"<<endl;
}	
class C:public A,public B
{
 public:
  void fun1(void);
  void fun2(int b);
};
void C::fun1(void)
{
}
void C::fun2(int b)
{
  cout<<"C"<<" b="<<b<<endl;
}
class D:public C
{
 public:
  void fun1(void);
  void fun2(void);
};
void D::fun1(void)
{
  cout<<"D1"<<endl;
}
void D::fun2(void)
{
  cout<<"D2"<<endl;
}
int main()
{
 A *pa;
 B *pb;
 C c;
 D d;
 pb=&c;
 pb->fun2(); 
 pa=&d;
 pa->fun1();
 pb=&d;
 pb->fun2(); 
 return(0);
}