C&O.OOP

#include <iostream>
#include <fstream>
#include <string>

// we can stick a function into a class

// 3 types: (we can call them modifiers)
// PUBLIC: everyone can see it
// PRIVATE: we can access it just inside the class, it's invisible outside of class
// PROTECTED: just for objects of classes, and their heirs

//
class Room1
{
private:
    double length;
    double breadth;
    double height;

public:
    void init(double len, double bred, double heig) {
        length = len;
        breadth = bred;
        height = heig;
    }

    double calculateArea() {
        return length * breadth;
    }

    double calculateVolume() {
        return length * breadth * height;
    }
};

//

//
class Room
{
public:
    double length;
    double breadth;
    double height;

    double calculateArea() {
        return length * breadth;
    }

    double calculateVolume() {
        return length * breadth * height;
    }
};

//

// first class
class YoutubeChannel
{
public:
    //char name[32];
    //char ownerName[24];
    std::string name;
    std::string ownerName;
    int subscriberCount;
};

// second class
class Book
{
public:
    std::string author;
    std::string title;
    int pages;
};

// third class
class BuckysClass
{
public:
    void coolSaying() {
        std::cout << "Preachin to the choir" << std::endl;
    }
};

// forth class
class Geeks
{
public:
    std::string geekName;
    int id;

    // it's just declared, it's not defined
    void printName();

    // printId is defined into a class
    void printId() {
        std::cout << "Geek id is: " << id;
    }
};

// defining a member function
void Geeks::printName() {
    std::cout << "Geek name is: " << geekName << std::endl;
}

int main() {
    YoutubeChannel youtubechannel;
    youtubechannel.name = "Vladimir";
    youtubechannel.ownerName = "Bootcamp";
    youtubechannel.subscriberCount = 10000;

    std::cout << "Name: " << youtubechannel.name << std::endl;
    std::cout << "Owner name: " << youtubechannel.ownerName << std::endl;
    std::cout << "Subscriber count: " << youtubechannel.subscriberCount << std::endl;

    // starting with new object

    Book book1;
    book1.author = "Harry Potter";
    book1.title = "JK Rowling";
    book1.pages = 500;

    std::cout << book1.author << std::endl;
    std::cout << book1.title << std::endl;
    std::cout << book1.pages << std::endl;

    // second object

    Book book2;
    book2.author = "Lord of the rings";
    book2.title = "Tolkin";
    book2.pages = 750;

    std::cout << book2.author << std::endl;
    std::cout << book2.title << std::endl;
    std::cout << book2.pages << std::endl;

    // the youtube example

    BuckysClass buckysClass;
    buckysClass.coolSaying();

    // geeks for geeks

    Geeks geek;
    geek.geekName = "Vladi";
    geek.id = 897;

    geek.printName();
    std::cout << std::endl;

    geek.printId();

    // from the youtube
    //
    // create object of Room class
    Room room1;

    // assign values to data members
    room1.length = 42.5;
    room1.breadth = 18.5;
    room1.height = 30.2;

    // calculate functions
    std::cout << "Area of room: "  << room1.calculateArea() << std::endl;
    std::cout << "Volume of room: " << room1.calculateVolume() << std::endl;

    // similar like previous

    Room1 room2;

    room2.init(42.5, 30.6, 18.7);

    std::cout << "Area of room: " << room2.calculateArea() << std::endl;
    std::cout << "Volume of room: " << room2.calculateVolume() << std::endl;


    return 0;
}