有如下程序: #include<iostream> using namespace std; class GrandChild{ public: GrandChild( ){strcpy(name,"Unknown");} const char*getName( )const{return name;} virtual char * getAddress( )const=0; private: char name[20]; }; class GrandSon:public GrandChild{ public: GrandSon(char * name){} char * getAddress( )const{return"Shanghai";} }; int main( ){ GrandChild * gs=new GrandSon("Feifei"); cout<<gs->getName( )<<"住在"<<gs->getAddress( )<<endl; delete gs; return 0; } 程序的输出结果是______。