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题目内容 (请给出正确答案)
有如下程序: include using namespace std; class A { public: virtual void f(){cout

有如下程序:

include<iostream>

using namespace std;

class A

{

public:

virtual void f(){cout<<"1";}

};

class B:public A

{

public:

B (){cout<<"2";}

};

class C:public B

{

public:

virtual void f(){B::f();cout<<"3";}

};

int main()

{

A aa,*p;

B bb;

C cc;

p=&cc;

p->f();

return 0;

}

执行上面程序的输出是______。


参考答案

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