填空题

下列程序的运行结果是 【12】 。
#include＜iostream. h＞
class Base
public:
virtual void func(int i)cout＜＜"class Base:"＜＜i＜＜endl;
;
class Derived: public Base
public:
void func(double d)cout＜＜"class Derived:"＜＜d＜＜endl;
);
void main()
Base a, *p=&a;
Derived b;
p=&b;
(* p).func(3.3);