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 #include using namespace std; class airport{private: string city; string code; vector 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 get_type() == 'P') num_passenger++; else if (airplanes[i]-get_type() == 'C') num_cargo++; } } cout

Question

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 #include using namespace std; class airport{private: string city; string code; vector 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 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 #include 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 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 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

BlackTom AI · Accepted Answer

The provided input appears to be a programming question about polymorphism in C++, but it does not include explicit answer options to evaluate. Instead, the payload contains a large amount of template code and notes, plus an example of how summary() and list_airplanes() might be implemented in airport.cpp, along with related class interfaces (airplane, passenger, cargo) and their methods (get_type(), print(), etc.). Since there are no multiple-choice options to analyze, I will outline a detailed, step-by-step reasoning approach you can use to verify or write the required implementations, and I will reference the snippets shown in the prompt as the intended direction. - First, recognize the core task: modify the base class airplane and the derived classes passenger and cargo, and implement the member functions summary and list_airplanes in airport.cpp. The airport class already provides memory management, copying, and add_airplane logic. The summary function should count how many airplanes are of type P (passenger) and C (cargo), and print airport metadata. The list_airplanes function should print all passenger airplanes first, then all cargo airplanes, invoking each airplane’s print() method. - Step-by-step reasoning for the likely required behavior: 1) Understand polymorphic storage: airport stores vector airplanes, holding objects created as either passenger or cargo, likely via new in add_airplane or in copy/clone logic. When traversing this vector, you must use a virtual interface to determine type and to print specifics. 2) Design considerations for summary(): - Iterate over airplanes. For each non-null entry, call get_type() on the airplane pointer. - If get_type() returns 'P', increment a passenger counter; if 'C', increment a cargo counter; any other value can be ignored or treated as error, depending on design choices. - After counting, print the airport metadata in a consistent format: Airport city: , Airport code:

, # Passenger airplanes: , # Cargo airplanes: .
     - Ensure the function is const-correct: it should not modify member data; it should only read airplanes. Also, since it prints, it should not alter the vector contents.
  3) Design considerations for list_airplanes():
     - Print a header for passenger airplanes: e.g., Passenger airplanes:
     - Iterate through airplanes and, for each non-null entry with get_type() == 'P', call print() on that airplane pointer. The print() method should output the airplane’s base information plus any subclass-specific details (handled inside passenger::print()).
     - Then print a header for cargo airplanes: Cargo airplanes:
     - Iterate again and print all cargo airplanes using print() where get_type() == 'C'.
     - Maintain the separation of types by performing two separate loops (or filter in a single loop) to ensure the required ordering: all passengers first, then all cargos.
  4) Interaction with existing code in the prompt: the snippet labeled Code for airport.cpp shows concrete implementations that align with the above reasoning:
     - summary prints Airport city and code, then counts and prints the numbers of passenger and cargo airplanes using a loop that checks airplanes[i] && airplanes[i]->get_type() == 'P' or 'C'.
     - list_airplanes first prints Passenger airplanes:, iterates to call print() on P-type airplanes, then prints Cargo airplanes:, and iterates again to call print() on C-type airplanes.
     - This matches the typical requirements and makes good use of the virtual interface (get_type and print) provided by the base and derived classes.
  5) Validation and potential pitfalls:
     - Be careful about null pointers: skip airplanes[i] if it is null to avoid segmentation faults.
     - Ensure no memory leaks occur: since summary() and list_airplanes() are const, they should not modify the airplane objects themselves; they simply call const methods (print() should be a const method in the appropriate derived class).
     - If get_type() is a virtual function, ensure all derived classes implement it and return the correct character ('P' for passenger, 'C' for cargo).
     - If the project uses a custom print() implementation in passenger and cargo (as suggested by the snippet), ensure those print() methods output the subclass-specific details in addition to the base class information.

- Summary of the intended correct implementations (as demonstrated in the prompt’s example):
  - airport::summary() const {
      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;
  }
  - 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();
          }
      }
  }

- If you were presented with answer options (as in a typical MCQ for this task), you would evaluate each option against these criteria: correct options would implement summary() and list_airplanes() exactly as described above, using the virtual interface of airplane, and correctly handling memory and type distinctions. Incorrect options would likely fail to distinguish between passenger and cargo types, would mishandle const-correctness, would mix ordering of output, or would not guard against null pointers.

- In the absence of explicit answer choices in the provided data, the above reasoning outlines the expected correct approach and how to verify it against the codebase. If you can provide the actual answer_options array or the specific choices you want analyzed, I can map each one to these criteria and produce a detailed, option-by-option evaluation.

COSC 1437 - 15099 - Introduction to Programming

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