下列程序的运行结果是 【12】 。
# 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；
obi=new C;
obj-＞use()
delete obj；
}