#include＜iostream.h＞
class A
{ int i;
public:
virtual void fun 1
{cout＜＜"A:fun 2"＜＜endl;}
A(int a)
{i=a;}
};
class B:public A
{ int j;
public:
void fun 3{cout＜＜"B::fun 4in";}
B(int b,int c){j=c;}
};
void main 5
{ A*p;
B b(3,5);
p=&b:
p-＞fun 6;
}