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$amp; }; void main( ) { A*obj; bj=new C; obj->use( ); delete obj; }