下列程序的运行结果是【　】。

# include＜iostream. h＞

class A

{

public:

virtual void use(){cout ＜＜ "in A\n"; }

}；

class B:public A

{

public:

virtual void use(){cout ＜＜ "in B\n"；}

};

class C: public B

{

public:

virtual void use() {cout＜＜ "in C\n"; }

}； void main()

{

A *obj；

bi=new C;

obj-＞use()

delete obj；

}