Вступ до патернів проектування

Transport.cpp

#include <iostream>
#include <string>

using namespace std;

class Transport 
{
public:
    virtual void input() = 0;
    virtual void info() = 0;
};

class Truck : public Transport 
{
private:
    string model;
    int capacity;

public:
    void input() override 
    {
        cout << "Enter truck model: ";
        cin >> model;
        cout << "Enter truck capacity: ";
        cin >> capacity;
    }

    void info() override 
    {
        cout << "Truck model: " << model << endl<<"Capacity: " << capacity << " t." << endl;
    }
};

class Ship : public Transport 
{
private:
    string name;
    int crew;

public:
    void input() override 
    {
        cout << "Enter ship name: ";
        cin >> name;
        cout << "Enter crew size: ";
        cin >> crew;
    }

    void info() override 
    {
        cout << "Ship name: " << name << endl;
        cout << "Crew: " << crew << endl;
    }
};

class Airplane : public Transport 
{
private:
    string model;
    int passengers;

public:
    void input() override 
    {
        cout << "Enter airplane model: ";
        cin >> model;
        cout << "Enter number of passengers: ";
        cin >> passengers;
    }

    void info() override 
    {
        cout << "Airplane model: " << model << endl;
        cout << "Passengers: " << passengers << endl;
    }
};

class TransportFactory 
{
public:
    virtual Transport* createTransport() = 0;
};

class TruckFactory : public TransportFactory 
{
public:
    Transport* createTransport() override 
    {
        return new Truck();
    }
};

class ShipFactory : public TransportFactory 
{
public:
    Transport* createTransport() override 
    {
        return new Ship();
    }
};


class AirplaneFactory : public TransportFactory 
{
public:
    Transport* createTransport() override 
    {
        return new Airplane();
    }
};

int main() 
{

    int choice;

    cout << "Choose transport:" << endl<< "1 - Truck" << endl<< "2 - Ship" << endl<< "3 - Airplane" << endl;
    cin >> choice;

    TransportFactory* x = nullptr;

    if (choice == 1)
        x = new TruckFactory();
    else if (choice == 2)
        x = new ShipFactory();
    else if (choice == 3)
        x = new AirplaneFactory();
    else 
    {
        cout << "EEEEEEEERRROOOORRRRR" << endl;
        return 0;
    }

    Transport* transport = x->createTransport();

    transport->input();
    transport->info();

    delete transport;
    delete x;

    return 0;
}