너무하시는데요.... 이런 오타를......*^^*
int get_classfooms();   -->   int get_classrooms();

루피블루 님이 쓰신 글 :
: #include <iostream.h>
:
: class building {
:   int rooms;
:   int floors;
:   int area;
:
: public:
:   void set_rooms(int num);
:   int get_rooms();
:   void set_floors(int num);
:   int get_floors();
:   void set_area(int num);
:   int get_area();
: };
:
: class house : public building {
:   int bedrooms;
:   int baths;
:
: public:
: void set_bedrooms(int num);
: int get_bedrooms();
: void set_baths(int num);
: int get_baths();
: };
:
: class school : public building {
:   int classrooms;
:   int offices;
: public:
:     void set_classrooms(int num);
:     int get_classfooms();
:     void set_offices(int num);
:     int get_offices();
:     };
:
: void building::set_rooms(int num)
: {
: rooms = num;
: }
: void building::set_floors(int num)
: {
: floors = num;
: }
: void building::set_area(int num)
: {
:  area  = num;
:  }
:  int building::get_rooms()
:  {
:  return rooms;
:  }
:  int building::get_floors()
:  {
:  return floors;
:  }
:  int building::get_area()
:  {
:  return area;
:  }
:  void house::set_bedrooms(int num)
:  {
:  bedrooms = num;
:  }
:  void house::set_baths(int num)
:  {
:  baths = num;
:
:  }
:  int house::get_bedrooms()
:  {
:  return bedrooms;
:  }
:  int house::get_baths()
:  {
:  return baths;
:  }
:  void school::set_classrooms(int num)
:  {
:  classrooms = num;
:  }
:  void school::set_offices(int num)
:  {
:  offices = num;
:  }
:  int school::get_classrooms()
:  {
:  return classrooms;
:  }
:  int school::get_offices()
:  {
:  return offices;
:  }
:  main()
:  {
:     house h;
:     school s;
:     h.set_rooms(12);
:     h.set_floors(3);
:     h.set_area(4500);
:     h.set_bedrooms(5);
:     h.set_baths(3);
:
:     cout << "house has" << h.get_bedrooms();
:     cout << "bedrooms\n";
:
:     s.set_rooms(20);
:     s.set_classrooms(180);
:     s.set_offices(5);
:     s.set_area(25000);
:
:     cout << "school has" << s.get_classrooms();
:     cout << "classrooms\n";
:     cout << "Its area is" << s.get_area();
:
:     return 0;
:     }
:
: 두분이 틀리는데... 선언이 도데체 어디가 틀린디;;; 알수 가 없어요 제발;;;