题目
Fal25_CS003C_74229 Ch. 9 Pre-Quiz (Remotely Proctored)
单项选择题
Consider a class that represents a hardware device. The device can be in one of two states: Plugged in, or unplugged. Which of the following class definitions is best for this situation?
选项
A.class Device :
def __init__(self) :
self.PLUGGED_IN = 0
self.UNPLUGGED = 1
. . .
B.class Device :
def __init__(self) :
PLUGGED_IN = 0
UNPLUGGED = 1
. . .
C.PLUGGED_IN = 0
UNPLUGGED = 1
class Device :
def __init__(self) :
. . .
D.class Device :
PLUGGED_IN = 0
UNPLUGGED = 1
def __init__(self) :
. . .
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标准答案
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思路分析
The problem presents a design choice for modeling a hardware device that can be either plugged in or unplugged, and asks which class definition is best for this situation.
Option A:
class Device :
def __init__(self) :
self.PLUGGED_IN = 0
self.UNPLUGGED = 1
. . .
In this version, the constants are defined as instance attributes inside __init__. This means every Device object would get its own copies of PLUGGED_IN and UNPLUGGED, which is unnecessary and wastefu......Login to view full explanation登录即可查看完整答案
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Question at position 26 In object-oriented programming, behaviors are defined as:ConstantsMethodsPackagesVariablesClear my selection
Question textFor this programming question, you will be working with Polymorphism. Given the base abstract class "airplane", the derived classes "passenger" and "cargo", and the container class "airport" (defined in airport.h): #ifndef AIRPORT_H#define AIRPORT_H #include "airplane.h"#include "passenger.h"#include "cargo.h" #include <vector>#include <string> using namespace std; class airport{private: string city; string code; vector<airplane *> airplanes; public: airport(const string &_city, const string &_code); airport(const airport &RHS); airport &operator=(const airport &RHS); ~airport(); void add_airplane(const airplane &plane); void summary() const; void list_airplanes() const;}; #endif Modify the base class airplane and the derived classes passenger and cargo (following the comments in the provided template files), and write the implementation of the member functions summary and list_airplanes. Here is the implementation of the other member functions of the "airport" class: airport::airport(const string &_city, const string &_code){ city = _city; code = _code;} airport::airport(const airport &RHS){ city = RHS.city; code = RHS.code; for (airplane *plane : RHS.airplanes) { if (plane != nullptr) { airplane *temp_plane; if (plane->get_type() == 'P') { temp_plane = new passenger(*((passenger *)plane)); } else { temp_plane = new cargo(*((cargo *)plane)); } airplanes.push_back(temp_plane); } }} airport &airport::operator=(const airport &RHS){ if (this != &RHS) { city = RHS.city; code = RHS.code; if (airplanes.size() > 0) // Delete allocated memory { for (int i = airplanes.size() - 1; i >= 0; i--) { if (airplanes.at(i) != nullptr) { delete airplanes.at(i); airplanes.pop_back(); } } } for (airplane *plane : RHS.airplanes) { if (plane != nullptr) { airplane *temp_plane; if (plane->get_type() == 'P') { temp_plane = new passenger(*((passenger *)plane)); } else { temp_plane = new cargo(*((cargo *)plane)); } airplanes.push_back(temp_plane); } } } return *this;} airport::~airport(){ if (airplanes.size() > 0) // Delete allocated memory { for (int i = airplanes.size() - 1; i >= 0; i--) { if (airplanes.at(i) != nullptr) { delete airplanes.at(i); airplanes.pop_back(); } } }} void airport::add_airplane(const airplane &plane){ airplane *temp_plane; if (plane.get_type() == 'P') { temp_plane = new passenger((const passenger &)plane); } else { temp_plane = new cargo((const cargo &)plane); } airplanes.push_back(temp_plane);} HINT: You can use the code from these functions when writing the solution for the requested member functions. NOTES: You can safely assume that the input is always correct. You must use function identifiers based on the specifications of the question when writing your solution. You do not need to write a main function. Solutions that do not compile will receive a 100 % penalty. Hardcoding the output will translate into a 100 % penalty. Answer:(penalty regime: 0 %)// In airport.cpp #include "airport.h" #include <iostream> using namespace std; void airport::summary() const { The program initializes two counters to track passenger and cargo aircraft numbers at zero. The program checks each airplane in the airplanes vector starting from index 0 until it reaches the end of the vector. The program checks the airplane type through its get_type method to determine if it should increment the passenger or cargo counter. The program uses the get_type method to determine if the airplane should increment the passenger or cargo counter. The program displays the airport location through its city field followed by its code field. The program displays the total number of passenger airplanes and Code for airplane.h 7891011121314151617181920212223242526272829303132333435363738 int num_passenger = 0, num_cargo = 0; for (size_t i = 0; i < airplanes.size(); ++i) { if (airplanes[i]) { if (airplanes[i]->get_type() == 'P') num_passenger++; else if (airplanes[i]->get_type() == 'C') num_cargo++; } } cout << "Airport city: " << city << endl; cout << "Airport code: " << code << endl; cout << "# Passenger airplanes: " << num_passenger << endl; cout << "# Cargo airplanes: " << num_cargo << endl;}void airport::list_airplanes() const { cout << "Passenger airplanes:" << endl; for (size_t i = 0; i < airplanes.size(); ++i) { if (airplanes[i] && airplanes[i]->get_type() == 'P') { airplanes[i]->print(); } } cout << "Cargo airplanes:" << endl; for (size_t i = 0; i < airplanes.size(); ++i) { if (airplanes[i] && airplanes[i]->get_type() == 'C') { airplanes[i]->print(); } }}// airplane.h#ifndef AIRPLANE_H ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Code for passenger.h 123456789101112131415161718192021222324252627282930313233343536#ifndef PASSENGER_H#define PASSENGER_H#include "airplane.h"#include <iostream>#include <string>using namespace std;// Implement public inheritance from the airplane class// Call the overloaded constructor of the base class in the class overloaded constructor// Use the virtual qualifier when neededclass passenger // Implement public inheritance from the airplane class { private: string airline; int n_passengers; public: passenger(const string & _manufacturer, const string & _model, const string & _tail_number, const string & _airline, int _n_passengers): // Call the overloaded constructor of the base class here { airline = _airline; n_passengers = _n_passengers; } ~passenger(){} char get_type() const {return 'P';} void print() const { airplane::print(); cout << ", Airline: " << airline << ", # of passengers: " << n_passengers << endl; }};#endif ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Code for cargo.h 1234567891011121314151617181920212223242526272829303132333435#ifndef CARGO_H#define CARGO_H#include "airplane.h"#include <iostream>using namespace std;// Implement public inheritance from the airplane class// Call the overloaded constructor of the base class in the class overloaded constructor// Use the virtual qualifier when neededclass cargo // Implement public inheritance from the airplane class { private: string company; int max_capacity; public: cargo(const string & _manufacturer, const string & _model, const string & _tail_number, const string & _company, int _max_capacity): // Call the overloaded constructor of the base class here { company = _company; max_capacity = _max_capacity; } ~cargo(){} char get_type() const {return 'C';} void print() const { airplane::print(); cout << ", Company: " << company << ", Max Capacity (tons): " << max_capacity << endl; }};#endif ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Code for airport.cpp 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152// Include the libraries to run compile your solution#include "airport.h"#include <iostream>using namespace std;// Write the implementation of the requested member functions void airport::summary const{ int num_passenger = 0, num_cargo = 0; for (size_t i=0, i < airplanes.size(); ++i) { if (airplane[i]) { if (airplane[i]) get_type() - > == 'P' num_passenger ++; else (airplane[i]) get_type() - > == "C" num_cargo ++; } cout <<"Airport city: " << city << endl; cout <<"Airport code: " << code << endl; cout <<"# Passeneger airplanes:" << num_passenger << endl; cout <<"# Cargo airplanes:" << num_cargo << endl;}void airport::list_airplane() const{ cout <<"Passenger airplanes:" endl; for (size_t i=0 i < airplane.size(); ++1 { if (airplane[i] && airplane[i] - > get_type() == 'P') airplane[i]- > print(); } cout <<"Cargo airplanes:" << endl; for (size_t i=0, i < airplanes.size(); ++1) { if (airplane[i] && airplane[i] - > get_type() == 'C') airplane[i] - > print(); }}// Output messages for the summary function// cout << "Airport city: " << /* variable identifier */ << endl;// cout << "Airport code: " << /* variable identifier */ << endl;// cout << "# Passenger airplanes: " << /* variable identifier */ << endl;// cout << "# Cargo airplanes: " << /* variable identifier */ << endl;// Output messages for the list_airplanes function// cout << "Passenger airplanes: " << endl;// cout << "Cargo airplanes: " << endl; ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field1"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field2"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field3"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field4"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); Check Question 1
Question textFor this programming question, you will be working with Polymorphism. Given the base abstract class "airplane", the derived classes "passenger" and "cargo", and the container class "airport" (defined in airport.h): #ifndef AIRPORT_H#define AIRPORT_H #include "airplane.h"#include "passenger.h"#include "cargo.h" #include <vector>#include <string> using namespace std; class airport{private: string city; string code; vector<airplane *> airplanes; public: airport(const string &_city, const string &_code); airport(const airport &RHS); airport &operator=(const airport &RHS); ~airport(); void add_airplane(const airplane &plane); void summary() const; void list_airplanes() const;}; #endif Modify the base class airplane and the derived classes passenger and cargo (following the comments in the provided template files), and write the implementation of the member functions summary and list_airplanes. Here is the implementation of the other member functions of the "airport" class: airport::airport(const string &_city, const string &_code){ city = _city; code = _code;} airport::airport(const airport &RHS){ city = RHS.city; code = RHS.code; for (airplane *plane : RHS.airplanes) { if (plane != nullptr) { airplane *temp_plane; if (plane->get_type() == 'P') { temp_plane = new passenger(*((passenger *)plane)); } else { temp_plane = new cargo(*((cargo *)plane)); } airplanes.push_back(temp_plane); } }} airport &airport::operator=(const airport &RHS){ if (this != &RHS) { city = RHS.city; code = RHS.code; if (airplanes.size() > 0) // Delete allocated memory { for (int i = airplanes.size() - 1; i >= 0; i--) { if (airplanes.at(i) != nullptr) { delete airplanes.at(i); airplanes.pop_back(); } } } for (airplane *plane : RHS.airplanes) { if (plane != nullptr) { airplane *temp_plane; if (plane->get_type() == 'P') { temp_plane = new passenger(*((passenger *)plane)); } else { temp_plane = new cargo(*((cargo *)plane)); } airplanes.push_back(temp_plane); } } } return *this;} airport::~airport(){ if (airplanes.size() > 0) // Delete allocated memory { for (int i = airplanes.size() - 1; i >= 0; i--) { if (airplanes.at(i) != nullptr) { delete airplanes.at(i); airplanes.pop_back(); } } }} void airport::add_airplane(const airplane &plane){ airplane *temp_plane; if (plane.get_type() == 'P') { temp_plane = new passenger((const passenger &)plane); } else { temp_plane = new cargo((const cargo &)plane); } airplanes.push_back(temp_plane);} HINT: You can use the code from these functions when writing the solution for the requested member functions. NOTES: You can safely assume that the input is always correct. You must use function identifiers based on the specifications of the question when writing your solution. You do not need to write a main function. Solutions that do not compile will receive a 100 % penalty. Hardcoding the output will translate into a 100 % penalty. Answer:(penalty regime: 0 %)// In airport.cpp #include "airport.h" #include <iostream> using namespace std; void airport::summary() const { The program initializes two counters to track passenger and cargo aircraft numbers at zero. The program checks Code for airplane.h 1234567891011121314151617181920212223242526272829// airplane.h#ifndef AIRPLANE_H#define AIRPLANE_H#include <string>#include <iostream>using namespace std;class airplane {private: string manufacturer; string model; string tail_number;public: airplane(const string& _manufacturer, const string& _model, const string& _tail_number) : manufacturer(_manufacturer), model(_model), tail_number(_tail_number) {} virtual char get_type() const = 0; virtual void print() const { cout << "Manufacturer: " << manufacturer << ", Model: " << model << ", Tail number: " << tail_number; } virtual ~airplane() {}};#endif ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Code for passenger.h 123456789101112131415161718192021222324252627282930313233343536#ifndef PASSENGER_H#define PASSENGER_H#include "airplane.h"#include <iostream>#include <string>using namespace std;// Implement public inheritance from the airplane class// Call the overloaded constructor of the base class in the class overloaded constructor// Use the virtual qualifier when neededclass passenger // Implement public inheritance from the airplane class { private: string airline; int n_passengers; public: passenger(const string & _manufacturer, const string & _model, const string & _tail_number, const string & _airline, int _n_passengers): // Call the overloaded constructor of the base class here { airline = _airline; n_passengers = _n_passengers; } ~passenger(){} char get_type() const {return 'P';} void print() const { airplane::print(); cout << ", Airline: " << airline << ", # of passengers: " << n_passengers << endl; }};#endif ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Code for cargo.h 1234567891011121314151617181920212223242526272829303132333435#ifndef CARGO_H#define CARGO_H#include "airplane.h"#include <iostream>using namespace std;// Implement public inheritance from the airplane class// Call the overloaded constructor of the base class in the class overloaded constructor// Use the virtual qualifier when neededclass cargo // Implement public inheritance from the airplane class { private: string company; int max_capacity; public: cargo(const string & _manufacturer, const string & _model, const string & _tail_number, const string & _company, int _max_capacity): // Call the overloaded constructor of the base class here { company = _company; max_capacity = _max_capacity; } ~cargo(){} char get_type() const {return 'C';} void print() const { airplane::print(); cout << ", Company: " << company << ", Max Capacity (tons): " << max_capacity << endl; }};#endif ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Code for airport.cpp 234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253#include "airport.h"#include <iostream>using namespace std;// Write the implementation of the requested member functions void airport::summary const{ int num_passenger = 0, num_cargo = 0; for (size_t i=0, i < airplanes.size(); ++i) { if (airplane[i]) { if (airplane[i]) get_type() - > == 'P' num_passenger ++; else (airplane[i]) get_type() - > == "C" num_cargo ++; } cout <<"Airport city: " << city << endl; cout <<"Airport code: " << code << endl; cout <<"# Passeneger airplanes:" << num_passenger << endl; cout <<"# Cargo airplanes:" << num_cargo << endl;}void airport::list_airplane() const{ cout <<"Passenger airplanes:" endl; for (size_t i=0 i < airplane.size(); ++1 { if (airplane[i] && airplane[i] - > get_type() == 'P') airplane[i]- > print(); } cout <<"Cargo airplanes:" << endl; for (size_t i=0, i < airplanes.size(); ++1) { if (airplane[i] && airplane[i] - > get_type() == 'C') airplane[i] - > print(); }}// Output messages for the summary function// cout << "Airport city: " << /* variable identifier */ << endl;// cout << "Airport code: " << /* variable identifier */ << endl;// cout << "# Passenger airplanes: " << /* variable identifier */ << endl;// cout << "# Cargo airplanes: " << /* variable identifier */ << endl;// Output messages for the list_airplanes function// cout << "Passenger airplanes: " << endl;// cout << "Cargo airplanes: " << endl;// I need you to modify the give code for airport.cpp ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field1"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field2"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field3"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field4"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); Check Question 1
Question textFor this programming question, you will be working with Polymorphism. Given the base abstract class "airplane", the derived classes "passenger" and "cargo", and the container class "airport" (defined in airport.h): #ifndef AIRPORT_H#define AIRPORT_H #include "airplane.h"#include "passenger.h"#include "cargo.h" #include <vector>#include <string> using namespace std; class airport{private: string city; string code; vector<airplane *> airplanes; public: airport(const string &_city, const string &_code); airport(const airport &RHS); airport &operator=(const airport &RHS); ~airport(); void add_airplane(const airplane &plane); void summary() const; void list_airplanes() const;}; #endif Modify the base class airplane and the derived classes passenger and cargo (following the comments in the provided template files), and write the implementation of the member functions summary and list_airplanes. Here is the implementation of the other member functions of the "airport" class: airport::airport(const string &_city, const string &_code){ city = _city; code = _code;} airport::airport(const airport &RHS){ city = RHS.city; code = RHS.code; for (airplane *plane : RHS.airplanes) { if (plane != nullptr) { airplane *temp_plane; if (plane->get_type() == 'P') { temp_plane = new passenger(*((passenger *)plane)); } else { temp_plane = new cargo(*((cargo *)plane)); } airplanes.push_back(temp_plane); } }} airport &airport::operator=(const airport &RHS){ if (this != &RHS) { city = RHS.city; code = RHS.code; if (airplanes.size() > 0) // Delete allocated memory { for (int i = airplanes.size() - 1; i >= 0; i--) { if (airplanes.at(i) != nullptr) { delete airplanes.at(i); airplanes.pop_back(); } } } for (airplane *plane : RHS.airplanes) { if (plane != nullptr) { airplane *temp_plane; if (plane->get_type() == 'P') { temp_plane = new passenger(*((passenger *)plane)); } else { temp_plane = new cargo(*((cargo *)plane)); } airplanes.push_back(temp_plane); } } } return *this;} airport::~airport(){ if (airplanes.size() > 0) // Delete allocated memory { for (int i = airplanes.size() - 1; i >= 0; i--) { if (airplanes.at(i) != nullptr) { delete airplanes.at(i); airplanes.pop_back(); } } }} void airport::add_airplane(const airplane &plane){ airplane *temp_plane; if (plane.get_type() == 'P') { temp_plane = new passenger((const passenger &)plane); } else { temp_plane = new cargo((const cargo &)plane); } airplanes.push_back(temp_plane);} HINT: You can use the code from these functions when writing the solution for the requested member functions. NOTES: You can safely assume that the input is always correct. You must use function identifiers based on the specifications of the question when writing your solution. You do not need to write a main function. Solutions that do not compile will receive a 100 % penalty. Hardcoding the output will translate into a 100 % penalty. Answer:(penalty regime: 0 %){"airplane_h":["// airplane.h\n#ifndef AIRPLANE_H\n#define AIRPLANE_H\n\n#include <string>\n#include <iostream>\nusing namespace std;\n\nclass airplane {\nprivate:\n string manufacturer;\n string model;\n string tail_number;\npublic:\n airplane(const string & _manufacturer, const string & _model, const string & _tail_number)\n : manufacturer(_manufacturer), model(_model), tail_number(_tail_number) {}\n virtual char get_type() const = 0;\n virtual void print() const {\n cout << \"Manufacturer: \" << manufacturer\n << \", Model: \" << model\n << \", Tail number: \" << tail_number;\n }\n virtual ~airplane() {}\n};\n\n#endif\n\n\n\n\n"],"passenger_h":["#ifndef PASSENGER_H\n#define PASSENGER_H\n\n#include \"airplane.h\"\n#include <iostream>\n#include <string>\nusing namespace std;\n\n// Implement public inheritance from the airplane class\n// Call the overloaded constructor of the base class in the class overloaded constructor\n// Use the virtual qualifier when needed\n\nclass passenger // Implement public inheritance from the airplane class \n{\n private:\n string airline;\n int n_passengers;\n public:\n passenger(const string & _manufacturer, const string & _model, \n const string & _tail_number, const string & _airline, int _n_passengers):\n // Call the overloaded constructor of the base class here\n {\n airline = _airline;\n n_passengers = _n_passengers;\n }\n ~passenger(){}\n char get_type() const {return 'P';}\n void print() const\n {\n airplane::print();\n cout << \", Airline: \" << airline <<\n \", # of passengers: \" << n_passengers << endl;\n }\n};\n\n#endif"],"cargo_h":["#ifndef CARGO_H\n#define CARGO_H\n\n#include \"airplane.h\"\n#include <iostream>\nusing namespace std;\n\n// Implement public inheritance from the airplane class\n// Call the overloaded constructor of the base class in the class overloaded constructor\n// Use the virtual qualifier when needed\n\nclass cargo // Implement public inheritance from the airplane class \n{\n private:\n string company;\n int max_capacity;\n public:\n cargo(const string & _manufacturer, const string & _model, \n const string & _tail_number, const string & _company, int _max_capacity):\n // Call the overloaded constructor of the base class here\n {\n company = _company;\n max_capacity = _max_capacity;\n }\n ~cargo(){}\n char get_type() const {return 'C';}\n void print() const\n {\n airplane::print();\n cout << \", Company: \" << company <<\n \", Max Capacity (tons): \" << max_capacity << endl;\n }\n};\n\n#endif"],"airport_cpp":["// Include the libraries to run compile your solution\n#include \"airport.h\"\n#include <iostream>\nusing namespace std;\n\n\n// Write the implementation of the requested member functions \nvoid airport::summary const\n{\n int num_passenger = 0, num_cargo = 0;\n for (size_t i=0, i < airplanes.size(); ++1\n {\n if (airplane[i])\n {\n if (airplane[i]) get_type() - > == 'P'\n num_passenger ++;\n else (airplane[i]) get_type() - > == \"C\"\n num_cargo ++;\n }\n cout <<\"Airport city: \" << city << endl;\n cout <<\"Airport code: \" << code << endl;\n cout <<\"# Passeneger airplanes:\" << num_passenger << endl;\n cout <<\"# Cargo airplanes:\" << num_cargo << endl;\n}\n\nvoid airport::list_airplane() const\n{\n cout <<\"Passenger airplane:\" endl;\n for (size_t i=0 i < airplane.size(); ++1\n {\n if (airplane[i] && airplane[i] - > get_type() == 'P')\n airplane[i]- > print();\n }\n cout <<\"Cargo airplane:\" << endl;\n for (size_t i=0, i < airplanes.size(); ++1)\n {\n if (airplane[i] && airplane[i] - > get_type() == 'C')\n airplane[i] - > print();\n }\n}\n\n// Output messages for the summary function\n// cout << \"Airport city: \" << /* variable identifier */ << endl;\n// cout << \"Airport code: \" << /* variable identifier */ << endl;\n// cout << \"# Passenger airplanes: \" << /* variable identifier */ << endl;\n// cout << \"# Cargo airplanes: \" << /* variable identifier */ << endl;\n\n// Output messages for the list_airplanes function\n// cout << \"Passenger airplanes: \" << endl;\n// cout << \"Cargo airplanes: \" << endl;\n\n"]} Code for airplane.h 12345678910111213141516171819202122232425262728293031// airplane.h#ifndef AIRPLANE_H#define AIRPLANE_H#include <string>#include <iostream>using namespace std;class airplane {private: string manufacturer; string model; string tail_number;public: airplane(const string & _manufacturer, const string & _model, const string & _tail_number) : manufacturer(_manufacturer), model(_model), tail_number(_tail_number) {} virtual char get_type() const = 0; virtual void print() const { cout << "Manufacturer: " << manufacturer << ", Model: " << model << ", Tail number: " << tail_number; } virtual ~airplane() {}};#endif ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Code for passenger.h 123456789101112131415161718192021222324252627282930313233343536#ifndef PASSENGER_H#define PASSENGER_H#include "airplane.h"#include <iostream>#include <string>using namespace std;// Implement public inheritance from the airplane class// Call the overloaded constructor of the base class in the class overloaded constructor// Use the virtual qualifier when neededclass passenger // Implement public inheritance from the airplane class { private: string airline; int n_passengers; public: passenger(const string & _manufacturer, const string & _model, const string & _tail_number, const string & _airline, int _n_passengers): // Call the overloaded constructor of the base class here { airline = _airline; n_passengers = _n_passengers; } ~passenger(){} char get_type() const {return 'P';} void print() const { airplane::print(); cout << ", Airline: " << airline << ", # of passengers: " << n_passengers << endl; }};#endif ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Code for cargo.h 1234567891011121314151617181920212223242526272829303132333435#ifndef CARGO_H#define CARGO_H#include "airplane.h"#include <iostream>using namespace std;// Implement public inheritance from the airplane class// Call the overloaded constructor of the base class in the class overloaded constructor// Use the virtual qualifier when neededclass cargo // Implement public inheritance from the airplane class { private: string company; int max_capacity; public: cargo(const string & _manufacturer, const string & _model, const string & _tail_number, const string & _company, int _max_capacity): // Call the overloaded constructor of the base class here { company = _company; max_capacity = _max_capacity; } ~cargo(){} char get_type() const {return 'C';} void print() const { airplane::print(); cout << ", Company: " << company << ", Max Capacity (tons): " << max_capacity << endl; }};#endif ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Code for airport.cpp 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152// Include the libraries to run compile your solution#include "airport.h"#include <iostream>using namespace std;// Write the implementation of the requested member functions void airport::summary const{ int num_passenger = 0, num_cargo = 0; for (size_t i=0, i < airplanes.size(); ++1 { if (airplane[i]) { if (airplane[i]) get_type() - > == 'P' num_passenger ++; else (airplane[i]) get_type() - > == "C" num_cargo ++; } cout <<"Airport city: " << city << endl; cout <<"Airport code: " << code << endl; cout <<"# Passeneger airplanes:" << num_passenger << endl; cout <<"# Cargo airplanes:" << num_cargo << endl;}void airport::list_airplane() const{ cout <<"Passenger airplane:" endl; for (size_t i=0 i < airplane.size(); ++1 { if (airplane[i] && airplane[i] - > get_type() == 'P') airplane[i]- > print(); } cout <<"Cargo airplane:" << endl; for (size_t i=0, i < airplanes.size(); ++1) { if (airplane[i] && airplane[i] - > get_type() == 'C') airplane[i] - > print(); }}// Output messages for the summary function// cout << "Airport city: " << /* variable identifier */ << endl;// cout << "Airport code: " << /* variable identifier */ << endl;// cout << "# Passenger airplanes: " << /* variable identifier */ << endl;// cout << "# Cargo airplanes: " << /* variable identifier */ << endl;// Output messages for the list_airplanes function// cout << "Passenger airplanes: " << endl;// cout << "Cargo airplanes: " << endl; ההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field1"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field2"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field3"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); M.util.js_pending('qtype_coderunner/userinterfacewrapper'); require(['qtype_coderunner/userinterfacewrapper'], function(amd) { amd.newUiWrapper("ace", "id_q55064:2_answer-ace_field4"); M.util.js_complete('qtype_coderunner/userinterfacewrapper'); }); Check Question 1
In a simulation program, why is it important to define classes representing key concepts like "Mouse" and "Environment"?
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