16-classes-objects.cpp

#include <iostream>

using namespace std;

class Book {
    public:
        string title;
        string author;
        int pages;

        Book() {
            cout << "Creating object" << endl;
        }

        // Sobrecarga de constructores.
        Book(string aTitle, string aAuthor, int aPages) {
            title = aTitle;
            author = aAuthor;
            pages = aPages;
        }

    private:
        string privateField;
};

class Student {
    public:
        string name;
        string major;
        double gpa;

        Student(string aName, string aMajor, double aGpa) {
            name = aName;
            major = aMajor;
            gpa = aGpa;
        }

        // Método de instancia público.
        bool hasHonors() {
            return gpa >= 3.5;
        }
};

class Movie {
    private:
        string title;
        string director;
        string rating;
    public:
        Movie(string aTitle, string aDirector, string aRating) {
            title = aTitle;
            director = aDirector;
            setRating(aRating);
        }

        void setRating(string aRating) {
            if (aRating == "G" || aRating == "PG" || aRating == "PG-13" || aRating == "R" || aRating == "NR")
                rating = aRating;
            else
                rating = "NR";
        }

        string getRating() {
            return rating;
        }
};

class Chef {
    public:
        void makeChicken() {
            cout << "The chef makes chicken" << endl;
        }

        void makeSalad() {
            cout << "The chef makes salad" << endl;
        }

        void makeSpecialDish() {
            cout << "The chef makes bqq ribs" << endl;
        }
};

// Herencia.
class ItalianChef: public Chef {
    public:
        void makePasta() {
            cout << "The italian chef makes pasta" << endl;
        }

        // Sobrescribe el método "makeSpecialDish" de la clase padre "Chef".
        void makeSpecialDish() {
            cout << "The italian chef makes chicken parm" << endl;
        }
};

int main() {
    Book book1; // Crea una instancia u objeto de la clase Book usando el constructor vacío.
    book1.title = "Harry Potter";
    book1.author = "JK Rowling";
    book1.pages = 500;

    Book book2;
    book2.title = "Lord of the Rings";
    book2.author = "Tolkien";
    book2.pages = 700;

    Book book3("Lord of the Rings 2", "Tolkien", 710); // Usa el constructor con parámetros.

    cout << book1.title << " - " << book1.author << " - " << book1.pages << endl;
    cout << book2.title << " - " << book2.author << " - " << book2.pages << endl;
    cout << book3.title << " - " << book3.author << " - " << book3.pages << endl;

    book2.pages = 650;

    cout << book2.pages;

    cout << "--------------------\n";

    Student student1("Jim", "Business", 2.4);
    Student student2("Pam", "Art", 3.6);

    cout << student1.hasHonors() << endl;
    cout << student2.hasHonors() << endl;

    cout << "--------------------\n";

    Movie movie1("The Avengers", "Joss Whedon", "PG-13");

    cout << movie1.getRating() << endl;

    movie1.setRating("Dog");

    cout << movie1.getRating() << endl;

    cout << "--------------------\n";

    Chef chef;
    chef.makeChicken();

    cout << "--------------------\n";

    ItalianChef italianChef;
    italianChef.makeChicken();
    italianChef.makePasta();
    italianChef.makeSpecialDish();

    return 0;
}