有如下程序：
#include
using namespace std;
class ONE
{
public:
virtual void f(){cout<<"l";}
};
class TWO:public ONE
{
public:
TWO(){cout<<"2";}
};
class THREE:public TWO
{
public:
virtual void f(){TWO::f(); cout<<"3";}
};
int main()
{
ONE aa, *p;
TWO bb;
THREE cc;
p = &cc;
p->f();
return 0;
}
执行上面程序的输出是 【 11 】 。