有下列程序:includeusing namespace std;class ONE{ public:virtual void f(){COUt
有下列程序:
include<iostream>
using namespace std;
class ONE
{
public:
virtual void f(){COUt<<"1";}
};
c1assTWO:public ONE
{
public:
TWO(){cout<<"2";}
};
class THREE:public TWO
{
pub
请帮忙给出正确答案和分析,谢谢!