My code keeps getting stuck whenever I continue after the first pause before changes are made. I can't figure out what else is the problem due to the fact I can't get past this, I have tried debugging but every change I make only seems to make the code not run. What is supposed to happen is after the original library books data are printed, I am supposed to check 3 out to patrons that I have made and other minor changes, then lastly the data is supposed to revert back to the original.
public static void Main(string[] args)
{
LibraryPatron patron1 = new LibraryPatron("John", "A123");
LibraryPatron patron2 = new LibraryPatron("Wick", "A122");
LibraryPatron patron3 = new LibraryPatron("Smith", "A121");
LibraryPatron[] x = { patron1, patron2, patron3 };
LibraryBook book1 = new LibraryBook("The Wright Guide to C#", "Andrew Wright", "UofL Press",
2011, "ZZ25 3G"); // 1st test book
LibraryBook book2 = new LibraryBook("Harriet Pooter", "IP Thief", "Stealer Books",
2001, "AG773 ZF"); // 2nd test book
LibraryBook book3 = new LibraryBook("The Color Mauve", "Mary Smith", "Beautiful Books Ltd.",
1986, "JJ438 4T"); // 3rd test book
LibraryBook book4 = new LibraryBook("The Guan Guide to SQL", "Jeff Guan", "UofL Press",
2019, "ZZ24 4F"); // 4th test book
LibraryBook book5 = new LibraryBook("The Big Book of Doughnuts", "Homer Simpson", "Doh Books",
2004, "AE842 7A"); // 5th test book
LibraryBook[] theBooks = { book1, book2, book3, book4, book5 }; // Test array of books
WriteLine("Original list of books");
WriteLine("----------------------");
PrintBooks(theBooks);
Pause();
// Make changes
book1.CheckOut(patron1);
book2.Publisher = "Borrowed Books";
book3.CheckOut(patron2);
book4.CallNumber = "AB123 4A";
book5.CheckOut(patron3);
book5.CopyrightYear = -1234; // Attempt invalid year
WriteLine("After changes");
WriteLine("-------------");
PrintBooks(theBooks);
Pause();
// Return the books
book1.ReturnToShelf();
book3.ReturnToShelf();
book5.ReturnToShelf();
WriteLine("After returning the books");
WriteLine("-------------------------");
PrintBooks(theBooks);
}
// Precondition: None
// Postcondition: The books have been printed to the console
public static void PrintBooks(LibraryBook[] books)
{
foreach (LibraryBook b in books)
{
WriteLine(b);
WriteLine();
}
}
// Precondition: None
// Postcondition: Pauses program execution until user presses Enter and
// then clears the screen
public static void Pause()
{
WriteLine("Press Enter to Continue...");
ReadLine();
Clear(); // Clear screen
}
public class LibraryBook
{
public readonly int DEFAULT_YEAR = DateTime.Now.Year; // Default copyright year is current year
private string _title; // The book's title
private string _author; // The book's author
private string _publisher; // The book's publisher
private int _copyrightYear; // The book's year of copyright
private string _callNumber; // The book's call number in the library
private bool _checkedOut; // The book's checked out status
public static LibraryPatron Patron { get; private set; }
// Precondition: theCopyrightYear >= 0
// Postcondition: The library book has been initialized with the specified
// values for title, author, publisher, copyright year, and
// call number. The book is not checked out.
public LibraryBook(String theTitle, String theAuthor, String thePublisher,
int theCopyrightYear, String theCallNumber)
{
Title = theTitle;
Author = theAuthor;
Publisher = thePublisher;
CopyrightYear = theCopyrightYear;
CallNumber = theCallNumber;
ReturnToShelf(); // Make sure book is not checked out
}
public string Title
{
// Precondition: None
// Postcondition: The title has been returned
get
{
return _title;
}
// Precondition: None
// Postcondition: The title has been set to the specified value
set
{
if (!string.IsNullOrWhiteSpace(_title))
{
throw new ArgumentOutOfRangeException($"{nameof(Title)} must not be null or empty values.");
}
_title = value.Trim();
}
}
public string Author
{
// Precondition: None
// Postcondition: The author has been returned
get
{
return _author;
}
// Precondition: None
// Postcondition: The author has been set to the specified value
set
{
_author = value;
}
}
public string Publisher
{
// Precondition: None
// Postcondition: The publisher has been returned
get
{
return _publisher;
}
// Precondition: None
// Postcondition: The publisher has been set to the specified value
set
{
_publisher = value;
}
}
public int CopyrightYear
{
// Precondition: None
// Postcondition: The copyright year has been returned
get
{
return _copyrightYear;
}
// Precondition: value >= 0
// Postcondition: The copyright year has been set to the specified value
set
{
if (value >= 0)
_copyrightYear = value;
else
throw new ArgumentOutOfRangeException($"{nameof(CopyrightYear)} must be >= 0.");
}
}
public string CallNumber
{
// Precondition: None
// Postcondition: The call number has been returned
get
{
return _callNumber;
}
// Precondition: None
// Postcondition: The call number has been set to the specified value
set
{
if (!string.IsNullOrWhiteSpace(_callNumber))
{
throw new ArgumentOutOfRangeException($"{nameof(CallNumber)} must not be null or empty values.");
}
_callNumber = value.Trim();
}
}
// Precondition: None
// Postcondition: The book is checked out
public void CheckOut(LibraryPatron x)
{
_checkedOut = true;
x = Patron;
}
// Precondition: None
// Postcondition: The book is not checked out
public void ReturnToShelf()
{
_checkedOut = false;
Patron = null;
}
// Precondition: None
// Postcondition: true is returned if the book is checked out,
// otherwise false is returned
public bool IsCheckedOut()
{
return _checkedOut;
}
// Precondition: None
// Postcondition: A string is returned representing the libary book's
// data on separate lines
public override string ToString()
{
string NL = Environment.NewLine; // Newline shortcut
return $"Title: {Title}{NL}Author: {Author}{NL}Publisher: {Publisher}{NL}" +
$"Copyright: {CopyrightYear}{NL}Call Number: {CallNumber}{NL}" +
$"{(_checkedOut == true ? "Check Out By: {Patron}" : "Not Checked Out" )}";
}
public class LibraryPatron
{
private string _patronName; // Name of the patron
private string _patronID; // ID of the patron
// Precondition: None
// Postcondition: The patron has been initialized with the specified name
// and ID
public LibraryPatron(string name, string id)
{
PatronName = name;
PatronID = id;
}
public string PatronName
{
// Precondition: None
// Postcondition: The patron's name has been returned
get
{
return _patronName;
}
// Precondition: None
// Postcondition: The patron's name has been set to the specified value
set
{
if (!string.IsNullOrWhiteSpace(_patronName))
{
throw new ArgumentOutOfRangeException($"{nameof(PatronName)} must not be null or empty values.");
}
_patronName = value.Trim();
}
}
public string PatronID
{
// Precondition: None
// Postcondition: The patron's ID has been returned
get
{
return _patronID;
}
// Precondition: None
// Postcondition: The patron's ID has been set to the specified value
set
{
if (!string.IsNullOrWhiteSpace(_patronID))
{
throw new ArgumentOutOfRangeException($"{nameof(PatronID)} must not be null or empty values.");
}
_patronID = value.Trim();
}
}
// Precondition: None
// Postcondition: A string is returned presenting the libary patron's data on
// separate lines
public override string ToString()
{
string NL = Environment.NewLine; // NewLine shortcut
return $"Name: {PatronName}{NL}ID: {PatronID}";
}
}
