Question

Define the class HotelRoom. The class has the following private data members: the room number (an integer) and daily rate (a double). Include a default constructor as well as a constructor with two parameters to initialize the room number and the room’s daily rate. The class should have get/set functions for all its private data members [20pts]. The constructors and the get/set functions must throw an invalid_argument exception if either one of the parameter values are negative. The exception handler should display the message “Negative Parameter” [20pts]. Include a toString() function that nicely formats and returns a string that displays the information about the hotel room [10pts].

1. Write a main function to test the class HotelRoom, create a HotelRoom object. Try to set the room rate to an invalid value to generate an exception. Invoke the toSting() function to display the HotelRoom object. [20pts]
2. Derive the classes GuestRoom form the base class HotelRoom. The GuestRoom has private data fields and public functions:
   1. The private data field capacity (an Integer) that represents the maximum number of guests that can occupy the room. [5pts]
   2. The private data member status (an integer), which represents the number of guests in the room (0 if unoccupied). [5pts]
   3. An integer data field days that represents the number of days the guests occupies the room. [5pts]
   4. Add constructors and get/set functions to the GuestRoom class. The set function for the status data member must throw an out_of_range exception if it tries to set status to value greater than the capacity. [30pts]
   5. The function calculateBill() that returns the amount of guest’s bill. [10pts]
   6. Redefine the function toString() that formats and returns a string containing all pertinent information about the GuestRoom. [15pts]
3. Derive the classes MeetingRoom form the base class HotelRoom. The class has the following private data filed sand public functions:
   1. A private data field seats, which represents the number of seats in the room. [5pts]
   2. An integer data field status (1 if the room is booked and 0 otherwise). [5pts]
   3. Add constructors and get/set functions to the GuestRoom class. [10pts]
   4. Redefine the function toSting() to format and return a string containing all pertinent information about the MeetingRoom. [20pts]
   5. The function CalculateBill(), which returns the amount of the bill for renting the room for one day. The function calculates the bill as follows: the number of seats multiplied by 10.00, plus 500.00. [20pts]
4. Write a main function to test the classes GuestRoom and MeetingRoom. Invoke the calculateBills and toStirng() in each of the objects. [40pts]]
5. Make changes to the HotelRoom class to implement polymorphism. Add a virtual function calculateBill() that returns 0.00 and make the toString() function in the HotelRoom class a virtual function. Write the function displayHotelRoom() that receive a base class type reference as a parameter, then invokes the functions calculateBill() and toString(). The function must return void. [50pts]

6. From the main function invoke the function displayHotelRoom() three separate times and each time send a HotelRoom, a GuestRoom, and a MeetingRoom type objects. [20pts]

7. Repeat parts e and f but make appropriate changes in such a way that HotelRoom is turned into an abstract base class. [50pts]

Answer 1

1. #include <iostream> #include <string> #include <sstream> using namespace std; class HotelRoom {    private:    int roomNumber;    double dailyRate;       public:    //constructors    HotelRoom()    {        roomNumber = 0;        dailyRate = 0.0;    }       HotelRoom(int roomNumber,double dailyRate)    {        this->roomNumber = roomNumber;        this->dailyRate = dailyRate;           }    //set and get methods    void setRoomNumber(int roomNumber)    {        try        {            if(roomNumber < 0)            throw std::invalid_argument( "Negative parameter" );                this->roomNumber = roomNumber;        }catch(invalid_argument& ia) {        cout << ia.what() << '\n';        }    }    int getRoomNumber()    {        return roomNumber;    }    void setDailyRate(double dailyRate)    {        try        {            if(dailyRate < 0)            throw std::invalid_argument( "Negative parameter" );                this->dailyRate = dailyRate;        }catch(invalid_argument& ia) {        cout << ia.what() << '\n';        }    }    double getDailyRate()    {        return dailyRate;    }    string toString()    {        stringstream ss;        ss<< "Hotel Room Number : "<<getRoomNumber()<<" Daily Rate : $"<<getDailyRate();        return ss.str();    } }; class GuestRoom : HotelRoom {    private:    int capacity;    int status;    int days;       public:       GuestRoom(int roomNumber,double dailyRate,int capacity,int status,int days):HotelRoom(roomNumber,dailyRate)    {        this->capacity = capacity;        this->status = status;        this->days = days;    }    void setCapacity(int capacity)    {        this->capacity = capacity;    }    int getCapacity()    {        return capacity;    }    void setStatus(int status)    {        try        {        if(status > capacity)        throw out_of_range("out of range");        this->status = status;        }catch(out_of_range& e) {        cout << e.what() << '\n';        }    }    void setDays(int days)    {        this->days = days;    }    int getDays()    {        return days;    }    double calculateBill()    {        return days* getDailyRate();    }    string toString()    {        stringstream ss;        ss<< "Guest Room Number : "<<getRoomNumber()<<" Daily Rate : $"<<getDailyRate()<<" Days : "<<getDays()<<" ";        return ss.str();    }    }; class MeetingRoom : HotelRoom {    private:    int numOfSeats;    int status;       public:    MeetingRoom(int roomNumber,double dailyRate,int numOfSeats,int status):HotelRoom(roomNumber,dailyRate)    {        this->numOfSeats = numOfSeats;        this->status = status;    }    void setNumOfSeats(int numOfSeats)    {        this->numOfSeats = numOfSeats;    }    int getNumOfSeats()    {        return numOfSeats;    }    void setStatus(int status)    {        this->status = status;    }    int getStatus()    {        return status;    }    string toString()    {        stringstream ss;        ss<< "Meeting Room Number : "<<getRoomNumber()<<" Daily Rate : $"<<getDailyRate()<<" Number of seats : "<<getNumOfSeats()<<" Status :"<<getStatus();        return ss.str();    }    double calculateBill()    {        return getNumOfSeats()*10.00 +500.00;    } }; int main() {       HotelRoom hr1(344,170.99);    cout<<hr1.toString();       cout<<endl;       GuestRoom gr(405,150.55,100,56,4);    cout<<gr.toString();       cout<<endl;       MeetingRoom mr(510,300.00,200,1);    cout<<mr.toString();    return 0; } Output: Hotel Room Number : 344 Daily Rate : $170.99 Guest Room Number : 405 Daily Rate : $150.55 Days : 4 Meeting Room Number : 510 Daily Rate : $300 Number of seats : 200 Status :1 2. #include <iostream> #include <string> #include <sstream> using namespace std; class HotelRoom {    private:    int roomNumber;    double dailyRate;       public:    //constructors    HotelRoom()    {        roomNumber = 0;        dailyRate = 0.0;    }       HotelRoom(int roomNumber,double dailyRate)    {        this->roomNumber = roomNumber;        this->dailyRate = dailyRate;           }    //set and get methods    void setRoomNumber(int roomNumber)    {        try        {            if(roomNumber < 0)            throw std::invalid_argument( "Negative parameter" );                this->roomNumber = roomNumber;        }catch(invalid_argument& ia) {        cout << ia.what() << '\n';        }    }    int getRoomNumber()    {        return roomNumber;    }    void setDailyRate(double dailyRate)    {        try        {            if(dailyRate < 0)            throw std::invalid_argument( "Negative parameter" );                this->dailyRate = dailyRate;        }catch(invalid_argument& ia) {        cout << ia.what() << '\n';        }    }    double getDailyRate()    {        return dailyRate;    }    virtual string toString()    {        stringstream ss;        ss<< "Hotel Room Number : "<<getRoomNumber()<<" Daily Rate : $"<<getDailyRate();        return ss.str();    }    virtual double calculateBill()    {        return 0.0;    } }; class GuestRoom : public HotelRoom {    private:    int capacity;    int status;    int days;       public:       GuestRoom(int roomNumber,double dailyRate,int capacity,int status,int days):HotelRoom(roomNumber,dailyRate)    {        this->capacity = capacity;        this->status = status;        this->days = days;    }    void setCapacity(int capacity)    {        this->capacity = capacity;    }    int getCapacity()    {        return capacity;    }    void setStatus(int status)    {        try        {        if(status > capacity)        throw out_of_range("out of range");        this->status = status;        }catch(out_of_range& e) {        cout << e.what() << '\n';        }    }    void setDays(int days)    {        this->days = days;    }    int getDays()    {        return days;    }    double calculateBill()    {        return days* getDailyRate();    }    string toString()    {        stringstream ss;        ss<< "Guest Room Number : "<<getRoomNumber()<<" Daily Rate : $"<<getDailyRate()<<" Days : "<<getDays()<<" ";        return ss.str();    }    }; class MeetingRoom : public HotelRoom {    private:    int numOfSeats;    int status;       public:    MeetingRoom(int roomNumber,double dailyRate,int numOfSeats,int status):HotelRoom(roomNumber,dailyRate)    {        this->numOfSeats = numOfSeats;        this->status = status;    }    void setNumOfSeats(int numOfSeats)    {        this->numOfSeats = numOfSeats;    }    int getNumOfSeats()    {        return numOfSeats;    }    void setStatus(int status)    {        this->status = status;    }    int getStatus()    {        return status;    }    string toString()    {        stringstream ss;        ss<< "Meeting Room Number : "<<getRoomNumber()<<" Daily Rate : $"<<getDailyRate()<<" Number of seats : "<<getNumOfSeats()<<" Status :"<<getStatus();        return ss.str();    }    double calculateBill()    {        return getNumOfSeats()*10.00 +500.00;    } }; void displayHotelRoom(HotelRoom &room) {    cout<<"Bill = $"<<room.calculateBill();    cout<<endl;    cout<<room.toString(); } int main() {       HotelRoom hr(344,170.99);    displayHotelRoom(hr);       cout<<endl;       GuestRoom gr(405,150.55,100,56,4);    displayHotelRoom(gr);       cout<<endl;       MeetingRoom mr(510,300.00,200,1);    displayHotelRoom(mr);    return 0; } Output: Bill = $0 Hotel Room Number : 344 Daily Rate : $170.99 Bill = $602.2 Guest Room Number : 405 Daily Rate : $150.55 Days : 4 Bill = $2500 Meeting Room Number : 510 Daily Rate : $300 Number of seats : 200 Status :1 Do ask if any doubt. 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