CSE1002 How to Serve a Coffee?

void guest::get()
 {
cin>>room_No>>name>>friend_Room_No;
}
 void hotel::get()
 {
cin>>num_Of_Guest;
 guest t;
 for (int i=0;i<num_Of_Guest;i++)
 {
t.get();
 stay_Det[t.room_No]=t;
 }
 cin>>first_Room_No;
 }
 void hotel::serve_Coffee()
 {
int i=first_Room_No;
 while (i!=-1)
 {cout<<stay_Det[i].name<<" "<<i<<endl;
 i=stay_Det[i].friend_Room_No;
 }
}