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______。
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