{ //precondition: none
//postcondition: console displays string
static void Main(string[] args)
{
LibraryBook book1 = new LibraryBook("Green Eggs and Ham", "Suess", "Dr Suess inc", 1999, "1234", 12);
LibraryJournal journal1 = new LibraryJournal("NRA Journal", "NRA inc", 2010, "123456", 13, 2, 3, "guns", "editor1");
LibraryMagazine mag1 = new LibraryMagazine("NRA Mag", "Guns inc", 2015, "12345", 12, 4, 1);
LibraryMovie movie1 = new LibraryMovie("Forrest Gump", "Bubba",
2005, "12567", 14, 2, "Ltn Dan", LibraryMediaItem.MediaType.DVD, LibraryMovie.MPAARatings.PG13);
LibraryMusic cD1 = new LibraryMusic("Kenny Chesney's top hits", "Kenny inc", 2010, "1234", 10, 2, "Kenny", LibraryMediaItem.MediaType.CD, 12);
LibraryPatron patron1 = new LibraryPatron("Damon", "12345"); //instances of objects from each class
string NL = Environment.NewLine; //shortcut for new line
Console.WriteLine("Library items to start:\n");
Console.WriteLine($"{book1}\n");
Console.WriteLine($"{journal1}\n");
Console.WriteLine($"{mag1}\n");
Console.WriteLine($"{movie1}\n");
Console.WriteLine($"{cD1}\n");
Console.WriteLine($"\n");//displays strings on console
Console.WriteLine("Library items with fee:\n");
Console.WriteLine($"{book1}{NL}Fee after 1 day late: {book1.CalcLateFee(1)}\n");
Console.WriteLine($"{journal1}{NL}Fee after 1 day late: {journal1.CalcLateFee(1)}\n");
Console.WriteLine($"{mag1}{NL}Fee after 1 day late: {mag1.CalcLateFee(1)}\n");
Console.WriteLine($"{movie1}{NL}Fee after 1 day late: {movie1.CalcLateFee(1)}\n");
Console.WriteLine($"{cD1}{NL}Fee after 1 day late: {cD1.CalcLateFee(1)}\n");
//displays strings+the late fee for 1 day late
}
// Precondition: thePatron != null
// Postcondition: The book is checked out
public void CheckOut(LibraryPatron thePatron)
{
_checkedOut = true;
if (thePatron != null)
{
Patron = thePatron;
}
else
{
throw new ArgumentNullException($"{nameof(thePatron)}", $"{nameof(thePatron)} must not be null");
}
}
// Precondition: None
// Postcondition: The book is not checked out
public void ReturnToShelf()
{
_checkedOut = false;
Patron = null; // Remove previously stored reference to patron
}