C# Debugging help

// class HotelRoom has child classes SingleRoom which costs less, // and Suite which costs more using static System.Console; class DebugTen04 { static void Main() { HotelRoom aRoom = new HotelRoom(234); SingleRoom aSingle = new SingleRoom(135); Suite aSuite = new Suite(453); WriteLine(aRoom.ToString()); WriteLine(aSingle.ToString()); WriteLine(aSuite.ToString(); } } class HotelRoom { public const double PREMIUM = 30.00; public const double STD_RATE = 89.99; private int roomNumber; protected double rate; public HotelRoom(double room) { roomNumber = room; rate = STANDARD_RATE; } public int RoomNumber { get { return roomNum; } } public char rate { get { return rate; } } overridden public string ToString() { string temp = GetType() + " Room " + RoomNumber + " Rate: " + Rate.ToString("C"); return string; } } class SingleRoom inheritsFrom HotelRoom { public SingleRoom(int room) : base (room) { rate -= PREMIUM; } } class Suite inheritsFrom HotelRoom { public Suite(int room) { rate += PREMIUM; } }