Question

I don’t know how I should handle passed objects pointer in my non-default constructor. I am doing this program wrong because I feel like I don’t know what I’m doing.

I’ve been stuck on this for a day and a half and I just don’t understand it. I will post majority of my homework where I must use default constructor and non default constructor. I will also include the class diagram that I’m using so you can see how variables/classes/methods function.

What should I be doing with passed pointers inside of non-default constructor? I can’t assign any values through here because it will tell me that its inaccessible. In this piece of code:

Book::Book(string title, Author *pAuthor, Publisher *pPublisher, double price)
    {
        setTitle(title);
        setPrice(price);
    }

Any idea how to use those pointers? Right now I can correctly pass everything by using default constructor, but I’m probably doing this wrong since I am using additional objects. Basically I shouldn’t have 2 lines with Author author; and Publisher publisher; but I don’t care at this point.

Please help!

Book.cpp file

#include <iostream>
#include <sstream>
using namespace std;

#include "Book.h"
#include "Publisher.h"
#include "Author.h"

class Book
{
    public:
        Book();
        Book(string title, Author *pAuthor, Publisher *pPublisher, double price);
        ~Book();
        void setTitle(string title);
        void setAuthorName(string first, string last);
        void setPublisher(string name, string address, string city);
        void setPrice(double price);
        string convertDoubleToString(double number);
        string getBookInfo();

    private:
        string title;
        double price;
        Author *pAuthor;
        Publisher *pPublisher;

    Author author;
    Publisher publisher;
};

Book::Book()
{
}

Book::Book(string title, Author *pAuthor, Publisher *pPublisher, double price)
{
    setTitle(title);
    setPrice(price);
}

Book::~Book()
{
}

void Book::setTitle(string  title)
{
    this->title = title;
}

void Book::setAuthorName(string first, string last)
{
    author.setFirstName(first);
    author.setLastName(last);
}

void Book::setPublisher(string name, string address, string city)
{
    publisher.setName(name);
    publisher.setAddress(address);
    publisher.setCity(city);
}

void Book::setPrice(double price)
{
    this->price = price;
}

string Book::convertDoubleToString(double number)
{
    return static_cast<ostringstream*>( &(ostringstream() << number) ) -> str();
}

string Book::getBookInfo()
{
    return title + "\n" + author.getFullName() + "\n" + publisher.getPublisherInfo() + "\n" + "$" + convertDoubleToString(price);
}

Main.cpp file:

#include <iostream>
#include <string>
using namespace std;

#include "Book.h"

int main()
{
    system("cls");

    cout << "Book 1" << endl;

    Author *pAuthor = new Author("John", "Doe");
    Publisher *pPublisher = new Publisher("Wrox", "10475 Crosspoint Blvd.", "Indianapolis");
    Book *pBook = new Book("Memory Management", pAuthor, pPublisher, 39.99);

    cout << pBook->getBookInfo() << endl;

    cout << endl << "Book 2" << endl;

    Book book;

    book.setTitle("Advanced C++ Programming");
    book.setAuthorName("Linda", "Smith");
    book.setPublisher("Microsoft Press", "One Microsoft Way", "Redmond");
    book.setPrice(49.99);

    cout << book.getBookInfo() << endl << endl;

    system("pause");

    return 0;
};

Author.cpp file:

#include <iostream>
#include <string>
using namespace std;

class Author
{
    public:
        Author();
        Author(string first, string last);
        string getFullName();
        void setFirstName(string first);
        void setLastName(string last);

    private:
        string firstName;
        string lastName;
};

Author::Author()
{
}

Author::Author(string first, string last)
{
    setFirstName(first);
    setLastName(last);
}

string Author::getFullName()
{
    return firstName + " " + lastName;
}

void Author::setFirstName(string first)
{
    this->firstName = first;
}

void Author::setLastName(string last)
{
    this->lastName = last;
}

Class Diagram:

Answer 1

After few minutes talking to my classmate I figured out that I was missing few vital lines of code.

I guess the problem with my question was that I don’t understand pointers how I should have. After few tips from professor and classmates I knew that I was missing few lines of code within default and non-default constructor.

Here I will show what I was exactly looking for:

Main.cpp file:

#include <iostream>
#include <string>
using namespace std;

#include "Book.h"

int main()
{
    system("cls");

    cout << "Book 1" << endl;

    Author *pAuthor = new Author("John", "Doe");
    Publisher *pPublisher = new Publisher("Wrox", "10475 Crosspoint Blvd.", "Indianapolis");
    Book *pBook = new Book("Memory Management", pAuthor, pPublisher, 39.99);

    cout << pBook->getBookInfo() << endl;

    cout << endl << "Book 2" << endl;

    Book *book = new Book();

    book->setTitle("Advanced C++ Programming");
    book->setAuthorName("Linda", "Smith");
    book->setPublisher("Microsoft Press", "One Microsoft Way", "Redmond");
    book->setPrice(49.99);

    cout << book->getBookInfo() << endl << endl;

    system("pause");

    return 0;
};

Book.cpp file:

#include <iostream>
#include <sstream>
using namespace std;

#include "Book.h"

Book::Book()
{
    pAuthor = new Author();
    pPublisher = new Publisher();
}

Book::Book(string title, Author* pAuthor, Publisher* pPublisher, double price)
{
    this->title = title;
    this->price = price;

    this->pPublisher = pPublisher;
    this->pAuthor = pAuthor;
}

Book::~Book()
{
    delete pAuthor;
    delete pPublisher;
}

void Book::setTitle(string  title)
{
    this->title = title;
}

void Book::setAuthorName(string first, string last)
{
    pAuthor->setFirstName(first);
    pAuthor->setLastName(last);
}

void Book::setPublisher(string name, string address, string city)
{
    pPublisher->setName(name);
    pPublisher->setAddress(address);
    pPublisher->setCity(city);
}

void Book::setPrice(double price)
{
    this->price = price;
}

string Book::convertDoubleToString(double number)
{
    return static_cast<ostringstream*>( &(ostringstream() << number) ) -> str();
}

string Book::getBookInfo()
{
    return title + "\n" + pAuthor->getFullName() + "\n" + pPublisher->getPublisherInfo() + "\n" + "$" + convertDoubleToString(price);
}