Question

C++

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 [3pts]. The constructors and the 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” [3pts]. Include a toString() function that nicely formats and returns a string that displays the information ( room number and rate) about the HotelRoom object. [2pts].

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. [2pts]
2. Derive the classes GuestRoom from the base class HotelRoom. The GuestRoom has private data fields and public functions as follows:
   1. The private data field capacity (an Integer) that represents the maximum number of guests that can occupy the room. [1pts]
   2. The private data member status (an integer), which represents the number of guests in the room (0 if unoccupied). [1pts]
   3. An integer data field days that represents the number of days the guests occupy the room. [1pts]
   4. Add constructors and get/set functions to the GuestRoom class. The set function for the status data field must throw an out_of_range exception if it tries to set status to value greater than the capacity. [3pts]
   5. The function calculateBill() that returns the amount of guest’s bill. [2pts]
   6. Redefine the function toString() that formats and returns a string containing all pertinent information about the GuestRoom. [2pts]
3. Derive the classes MeetingRoom from the base class HotelRoom. The class has the following private data fields and public functions:
   1. A private data field seats, which represents the number of seats in the room. [1pts]
   2. An integer data field status (1 if the room is booked and 0 otherwise). [1pts]
   3. Add constructors and get/set functions to the MeetingRoom class. [1pts]
   4. Redefine the function toSting() to format and return a string containing all pertinent information about the MeetingRoom. [2pts]
   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. [2pts]
4. Write a main function to test the classes GuestRoom and MeetingRoom. Invoke the calculateBills and toStirng() in each of the objects. [4pts]

Answer 1

a)

#include <iostream>

using namespace std;

// HotelRoom class

class HotelRoom{

// private data members

private:

// int room number and double rate

int roomNumber;

double rate;

// public constructors,getters and setters

public:

// default constructor

HotelRoom(){

roomNumber=0;

rate=0;

}

// constructor with parameters

HotelRoom(int roomNumber,double rate){

// string exception for negative parameter

string invalid_argument="Negative Parameter";

// if either room number or rate parameter is negative then throw exception

if(roomNumber<0)

throw invalid_argument;

if(rate<0)

throw invalid_argument;

// set arguments to the private data members

this->roomNumber=roomNumber;

this->rate=rate;

}

// getters for data members

int getRoomNumber(){

return this->roomNumber;

}

double getRate(){

return this->rate;

}

// setters for data members

void setRoomNumber(int roomNumber){

// if room number argument is negative throw exception

string invalid_argument="Negative Parameter";

if(roomNumber<0)

throw invalid_argument;

// else set room member data member

this->roomNumber=roomNumber;

}

void setRate(double rate){

// if rate is negative throw exception

string invalid_argument="Negative Parameter";

if(rate<0)

throw invalid_argument;

// else set rate data member

this->rate=rate;

}

// toString method

// returns string containing details of HotelRoom object

string toString(){

// return string formation

string retString="Rate for room number ";

retString.append(to_string(this->roomNumber));

string str2=" is ";

str2.append(to_string(this->rate));

retString.append(str2);

// return the string formed

return retString;

}

};

// main function

int main() {

// create a HotelRoom object

HotelRoom room;

// inside try catch

try{

// initialize HotelRoom object with negative numbers

room=HotelRoom(-1,34);

}catch(string exception){

// print the exception raised

cout<<exception<<endl;

}

// print HotelRoom object

cout<<room.toString()<<endl;

}

#include <iostream>
using namespace std;
// HotelRoom class
class HotelRoom{
  // private data members
  private:
  // int room number and double rate
  int roomNumber;
  double rate;
  // public constructors,getters and setters
  public:
  // default constructor
  HotelRoom(){
    roomNumber=0;
    rate=0;
  }
  // constructor with parameters
  HotelRoom(int roomNumber,double rate){
    // string exception for negative parameter
    string invalid_argument="Negative Parameter";
    // if either room number or rate parameter is negative then throw exception
    if(roomNumber<0)
      throw invalid_argument;
    if(rate<0)
      throw invalid_argument;
    // set arguments to the private data members
    this->roomNumber=roomNumber;
    this->rate=rate;
  }
  // getters for data members
  int getRoomNumber(){
    return this->roomNumber;
  }
  double getRate(){
    return this->rate;
  }
  // setters for data members
  void setRoomNumber(int roomNumber){
    // if room number argument is negative throw exception
    string invalid_argument="Negative Parameter";
    if(roomNumber<0)
      throw invalid_argument;
    // else set room member data member
    this->roomNumber=roomNumber;
  }
  void setRate(double rate){
    // if rate is negative throw exception
    string invalid_argument="Negative Parameter";
    if(rate<0)
      throw invalid_argument;
    // else set rate data member
    this->rate=rate;
  }
  // toString method 
  // returns string containing details of HotelRoom object
  string toString(){
    // return string formation
    string retString="Rate for room number ";
    retString.append(to_string(this->roomNumber));
    string str2=" is ";
    str2.append(to_string(this->rate));
    retString.append(str2);
    // return the string formed
    return retString;
  }
};
// main function
int main() {
  // create a HotelRoom object
  HotelRoom room;
  // inside try catch
  try{
    // initialize HotelRoom object with negative numbers
    room=HotelRoom(-1,34);
  }catch(string exception){
    // print the exception raised
    cout<<exception<<endl;
  }
  // print HotelRoom object
  cout<<room.toString()<<endl;
}

Negative Parameter Rate for room number 0 is 0.000000

b,c,d)

#include <iostream>

using namespace std;

// HotelRoom class

class HotelRoom{

// private data members

private:

// int room number and double rate

int roomNumber;

double rate;

// public constructors,getters and setters

public:

// default constructor

HotelRoom(){

roomNumber=0;

rate=0;

}

// constructor with parameters

HotelRoom(int roomNumber,double rate){

// string exception for negative parameter

string invalid_argument="Negative Parameter";

// if either room number or rate parameter is negative then throw exception

if(roomNumber<0)

throw invalid_argument;

if(rate<0)

throw invalid_argument;

// set arguments to the private data members

this->roomNumber=roomNumber;

this->rate=rate;

}

// getters for data members

int getRoomNumber(){

return this->roomNumber;

}

double getRate(){

return this->rate;

}

// setters for data members

void setRoomNumber(int roomNumber){

// if room number argument is negative throw exception

string invalid_argument="Negative Parameter";

if(roomNumber<0)

throw invalid_argument;

// else set room member data member

this->roomNumber=roomNumber;

}

void setRate(double rate){

// if rate is negative throw exception

string invalid_argument="Negative Parameter";

if(rate<0)

throw invalid_argument;

// else set rate data member

this->rate=rate;

}

// toString method

// returns string containing details of HotelRoom object

string toString(){

// return string formation

string retString="Rate for room number ";

retString.append(to_string(this->roomNumber));

string str2=" is ";

str2.append(to_string(this->rate));

retString.append(str2);

// return the string formed

return retString;

}

};

// GuestRoom class deriving from HotelRoom

// all public parts of HotelRoom going to public portion of GuestRoom

class GuestRoom:public HotelRoom{

// private members of guestRoom is room capacity,status which contains number of occupants and

// days denoting number of days for which the room is booked

private:

int capacity;

int status;

int days;

// public constructors

public:

// default

GuestRoom(){

this->capacity=0;

this->status=0;

this->days=0;

}

// call to setters functions with appropriate parameters

GuestRoom(int capacity,int status,int days){

this->setCapacity(capacity);

this->setStatus(status);

this->setDays(days);

}

// setters

void setCapacity(int capacity){

this->capacity=capacity;

}

void setStatus(int status){

// thorw out_of_range exception if number of guests is greater than capacity of room

string out_of_range="Number of guests out of capacity of the room";

if(status>this->capacity)

throw out_of_range;

this->status=status;

}

void setDays(int days){

this->days=days;

}

// getters

int getCapacity(){

return this->capacity;

}

int getStatus(){

return this->status;

}

int getDays(){

return this->days;

}

// calculate Bill function which returns product of room rate and number of days occupied

double calculateBill(){

return this->getRate()*this->getDays();

}

// toString function which returns a string containing all the details of the gurst room

string toString(){

string str1="Guest room number ";

str1.append(to_string(this->getRoomNumber()));

string str11=" capacity is ";

str11.append(to_string(this->capacity));

string str2=" ,currently having ";

str2.append(to_string(this->status));

string str3=" occupants for ";

str3.append(to_string(this->days));

str3.append(" days at rate per day of ");

str3.append(to_string(this->getRate()));

str2.append(str3);

str11.append(str2);

str1.append(str11);

return str1;

}

};

// MeetingRoom class derived from HotelRoom where all public members of HotelRoom goes to public part of MeetingRoom.

class MeetingRoom:public HotelRoom{

// private data members

private:

// number of seats in meeting room

int seats;

// status of room

// 0 if unoccupied,1 if occupied

int status;

// public constructors

public:

// default

MeetingRoom(){

this->seats=0;

this->status=0;

}

// call to setters appropriatly for paramaterized constructors

MeetingRoom(int seats,int status){

this->setSeats(seats);

this->setStatus(status);

}

// setters

void setSeats(int seats){

this->seats=seats;

}

void setStatus(int status){

this->status=status;

}

// getters

int getSeats(){

return this->seats;

}

int getStatus(){

return this->status;

}

// calculate bill function which return product of number of seats and 10 added with 500.

double calculateBill(){

return this->getSeats()*10+500;

}

// toString function which returns string containing all the relevant details of the meeting room

string toString(){

string str1="Meeting room number ";

str1.append(to_string(this->getRoomNumber()));

string str11= " ,having ";

str11.append(to_string(this->seats));

string str2=" seats is ";

// check for status of the room

if(this->status)

str2.append("booked.");

else

str2.append("not booked.");

str11.append(str2);

str1.append(str11);

return str1;

}

};

// main function

int main() {

// create a Guest Room and Meeting room objects

GuestRoom groom;

MeetingRoom mroom;

// inside try catch

try{

// call to relevant setters for both GuestRoom and MeetingRoom objects

groom.setCapacity(10);

groom.setDays(5);

groom.setRate(500);

groom.setRoomNumber(101);

groom.setStatus(5);

mroom.setSeats(300);

mroom.setStatus(1);

mroom.setRoomNumber(303);

// call to toString and calculateBill methods for both GuestRoom and MeetingRoom objects

cout<<groom.toString()<<endl;

cout<<groom.getRoomNumber()<<" room number's bill is "<<groom.calculateBill()<<endl;

cout<<mroom.toString()<<endl;

cout<<mroom.getRoomNumber()<<" room number's bill is "<<mroom.calculateBill()<<endl;

}catch(string exception){

// print the exception raised

cout<<exception<<endl;

}

}

#include <iostream>
using namespace std;
// HotelRoom class
class HotelRoom{
  // private data members
  private:
  // int room number and double rate
  int roomNumber;
  double rate;
  // public constructors,getters and setters
  public:
  // default constructor
  HotelRoom(){
    roomNumber=0;
    rate=0;
  }
  // constructor with parameters
  HotelRoom(int roomNumber,double rate){
    // string exception for negative parameter
    string invalid_argument="Negative Parameter";
    // if either room number or rate parameter is negative then throw exception
    if(roomNumber<0)
      throw invalid_argument;
    if(rate<0)
      throw invalid_argument;
    // set arguments to the private data members
    this->roomNumber=roomNumber;
    this->rate=rate;
  }
  // getters for data members
  int getRoomNumber(){
    return this->roomNumber;
  }
  double getRate(){
    return this->rate;
  }
  // setters for data members
  void setRoomNumber(int roomNumber){
    // if room number argument is negative throw exception
    string invalid_argument="Negative Parameter";
    if(roomNumber<0)
      throw invalid_argument;
    // else set room member data member
    this->roomNumber=roomNumber;
  }
  void setRate(double rate){
    // if rate is negative throw exception
    string invalid_argument="Negative Parameter";
    if(rate<0)
      throw invalid_argument;
    // else set rate data member
    this->rate=rate;
  }
  // toString method 
  // returns string containing details of HotelRoom object
  string toString(){
    // return string formation
    string retString="Rate for room number ";
    retString.append(to_string(this->roomNumber));
    string str2=" is ";
    str2.append(to_string(this->rate));
    retString.append(str2);
    // return the string formed
    return retString;
  }
};
// GuestRoom class deriving from HotelRoom
// all public parts of HotelRoom going to public portion of GuestRoom
class GuestRoom:public HotelRoom{
  // private members of guestRoom is room capacity,status which contains number of occupants and 
  // days denoting number of days for which the room is booked
  private:
  int capacity;
  int status;
  int days;
  // public constructors
  public:
  // default 
  GuestRoom(){
    this->capacity=0;
    this->status=0;
    this->days=0;
  }
  // call to setters functions with appropriate parameters
  GuestRoom(int capacity,int status,int days){
    this->setCapacity(capacity);
    this->setStatus(status);
    this->setDays(days);
  }
  // setters
  void setCapacity(int capacity){
    this->capacity=capacity;
  }
  void setStatus(int status){
    // thorw out_of_range exception if number of guests is greater than capacity of room
    string out_of_range="Number of guests out of capacity of the room";
    if(status>this->capacity)
      throw out_of_range;
    this->status=status;
  }
  void setDays(int days){
    this->days=days;
  }
  // getters 
  int getCapacity(){
    return this->capacity;
  }
  int getStatus(){
    return this->status;
  }
  int getDays(){
    return this->days;
  }
  // calculate Bill function which returns product of room rate and number of days occupied
  double  calculateBill(){
    return this->getRate()*this->getDays();
  }
  // toString function which returns a string containing all the details of the gurst room
  string toString(){
    string str1="Guest room number ";
    str1.append(to_string(this->getRoomNumber()));
    string str11=" capacity is ";
    str11.append(to_string(this->capacity));
    string str2=" ,currently having ";
    str2.append(to_string(this->status));
    string str3=" occupants for ";
    str3.append(to_string(this->days));
    str3.append(" days at rate per day of ");
    str3.append(to_string(this->getRate()));
    str2.append(str3);
    str11.append(str2);
    str1.append(str11);
    return str1;
  }

};
// MeetingRoom class derived from HotelRoom where all public members of HotelRoom goes to public part of MeetingRoom.
class MeetingRoom:public HotelRoom{
  // private data members
  private:
  // number of seats in meeting room
  int seats;
  // status of room
  // 0 if unoccupied,1 if occupied
  int status;
  // public constructors
  public:
  // default
  MeetingRoom(){
    this->seats=0;
    this->status=0;
  }
  // call to setters appropriatly for paramaterized constructors
  MeetingRoom(int seats,int status){
    this->setSeats(seats);
    this->setStatus(status);
  }
  // setters
  void setSeats(int seats){
    this->seats=seats;
  }
  void setStatus(int status){
    this->status=status;
  }
  // getters
  int getSeats(){
    return this->seats;
  }
  int getStatus(){
    return this->status;
  }
  // calculate bill function which return product of number of seats and 10 added with 500.
  double  calculateBill(){
    return this->getSeats()*10+500;
  }
  // toString function which returns string containing all the relevant details of the meeting room
  string toString(){
    string str1="Meeting room number ";
    str1.append(to_string(this->getRoomNumber()));
    string str11= " ,having ";
    str11.append(to_string(this->seats));
    string str2=" seats is ";
    // check for status of the room
    if(this->status)
      str2.append("booked.");
    else
      str2.append("not booked.");
    
    str11.append(str2);
    str1.append(str11);
    return str1;
  }

};
// main function
int main() {
  // create a Guest Room and Meeting room  objects
  GuestRoom groom;
  MeetingRoom mroom;
  // inside try catch
  try{
    // call to relevant setters for both GuestRoom and MeetingRoom objects
    groom.setCapacity(10);
    groom.setDays(5);
    groom.setRate(500);
    groom.setRoomNumber(101);
    groom.setStatus(5);

    mroom.setSeats(300);
    mroom.setStatus(1);
    mroom.setRoomNumber(303);

    // call to toString and calculateBill methods for both GuestRoom and MeetingRoom objects
    cout<<groom.toString()<<endl;
    cout<<groom.getRoomNumber()<<" room number's bill is "<<groom.calculateBill()<<endl;
    cout<<mroom.toString()<<endl;
    cout<<mroom.getRoomNumber()<<" room number's bill is "<<mroom.calculateBill()<<endl; 


  }catch(string exception){
    // print the exception raised
    cout<<exception<<endl;
  }
}

Guest room number 101 capacity is 10 currently having 5 occupants for 5 days at rate per day of 500.000000 101 room number's bill is 2500 Meeting room number 303 , having 300 seats is booked. 303 room number's bill is 3500