下列程序的输出结果是______。 include using namespace std; class base { public: in

下列程序的输出结果是______。

include＜iostream＞

using namespace std;

class base

{

public:

int n;

base(int x){n=x;}

virtual void set(int m){n=m;cout＜＜n＜＜'';}

};

class deriveA:public base

{

public:

deriveA(int x):base(x){}

void set(int m){n+=m;cout＜＜n＜＜'';}

};

class deriveB:public base

{

public:

deriveB(int x):base(x){}

void set(int m){n+=m;cout＜＜n＜＜'';}

};

int main( )

{

deriveA d1(1);

deriveB.d2(3);

base*pbase;

pbase=&d1;

pbase-＞set(1);

pbase=&d2;

pbase-＞set(2);

return 0;

}