下面程序的运行结果是 #include classbase { protected: inta; public: base(){cout&lt

题目内容(请给出正确答案)

下面程序的运行结果是

#include

class base

{

protected:

int a;

public:

base(){ cout <<”0”;}

class basel:virtual base

}

public:

base 1(){cout <<”1”;}

};

class base2:virtual base

{

public:

base2(){cout <<”2”;(

};

class derived:public base1,public base2

{

public:

derived(){cout <<”3”;}

};

void main()

{

derived obj;

cout <

}

A.0123

B.3120

C.0312

D.3012

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