book.cpp

#include "book.h"

#include <iostream>

void book::print()
{
    print_title();
    print_author();
    print_text();
}

void book::print_text()
{
    std::cout << text << "\n";
}

void book::print_title()
{
    std::cout << title << "\n";
}

void book::print_author()
{
    std::cout << author << "\n";
}

book.h

#pragma once

#include <string>

class book
{
  private:
    std::string text;
    std::string author;
    std::string title;

    void print_text();
    void print_author();
    void print_title();

  public:
    book(
        const std::string &text,
        const std::string &author,
        const std::string &title)
        : text(text),
          author(author),
          title(title)
    {
    }

    void print();
};

furniture.cpp

#include "furniture.h"

#include <iostream>

Stool::Stool(int n_legs, int n_seats)
{
    this->n_legs = n_legs;
    this->n_seats = n_seats;
}

void Stool::print()
{
    std::cout << "This stool has " << n_legs << " legs and " << n_seats << " seats" << std::endl;
}

void Stool::removeLeg()
{
    n_legs--; // Er staat nergens dat we ervoor moeten zorgen dat dit een positief getal blijft
}

Table::Table(int n_legs, int length, int width)
{
    this->n_legs = n_legs;
    this->length = length;
    this->width = width;
}

void Table::print()
{
    std::cout << "This table has " << n_legs << " legs, is " << length << "m long and " << width << "m wide" << std::endl;
}

void Table::addLegs(int count)
{
    n_legs += 4;
}

Furniture::Furniture(Stool stool1, Stool stool2, Stool stool3, Stool stool4, Table table) : stool1(stool1), stool2(stool2), stool3(stool3), stool4(stool4), table(table)
{
}

void Furniture::print()
{
    stool1.print();
    stool2.print();
    stool3.print();
    stool4.print();
    table.print();
}

void Furniture::makeMoreHipster()
{
    stool1.removeLeg();
    stool2.removeLeg();
    stool3.removeLeg();
    stool4.removeLeg();
    table.addLegs(4);
}

furniture.h

#pragma once

class Stool
{
private:
  int n_legs;
  int n_seats;

public:
  Stool(int n_legs, int n_seats);

  void print();
  void removeLeg();
};

class Table
{
private:
  int n_legs;
  int length;
  int width;

public:
  Table(int n_legs, int length, int width);

  void print();
  void addLegs(int count);
};

class Furniture
{
private:
  Stool stool1;
  Stool stool2;
  Stool stool3;
  Stool stool4;
  Table table;

public:
  Furniture(Stool stool1, Stool stool2, Stool stool3, Stool stool4, Table table);

  void makeMoreHipster();
  void print();
};

main.cpp

#include <iostream>

#include "book.h"
#include "furniture.h"

int main()
{
    book b("(this page is intentionally left blank)", "Frans Willem", "JavaScript: The Good Parts");
    b.print();

    Stool stool1(4, 1);
    Stool stool2(4, 1);
    Stool stool3(6, 1);
    Stool stool4(6, 1);
    Table table(4, 4, 3);
    Furniture furniture(stool1, stool2, stool3, stool4, table);

    std::cout << "Normal furniture" << std::endl;
    furniture.print();

    std::cout << "Hipster furniture" << std::endl;
    furniture.makeMoreHipster();
    furniture.print();

    return 0;
}