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using System;

public struct Book
{
	public string title;
	public string category;
	public string author;
	public int numPages;
	public int currentPage;
	public double ISBN;
	public string coverStyle;
	public Book(string title, string category, string author, int numPages, int currentPage, double isbn, string cover)
	{
		this.title = title;
		this.category = category;
		this.author = author;
		this.numPages = numPages;
		this.currentPage = currentPage;
		this.ISBN = isbn;
		this.coverStyle = cover;
	}

	public void nextPage()
	{
		if (this.currentPage != this.numPages)
		{
			this.currentPage++;
			Console.WriteLine("Current page is now: " + this.currentPage);
		}
		else
		{
			Console.WriteLine("At end of book.");
		}
	}

	public void prevPage()
	{
		if (this.currentPage != 1)
		{
			this.currentPage--;
			Console.WriteLine("Current page is now: " + this.currentPage);
		}
		else
		{
			Console.WriteLine("At the beginning of the book.");
		}
	}
}

public class Program
{
	public static void Main()
	{
		Book myBook = new Book("MCSD Certification Toolkit (Exam 70-483)", "Certification", "Covaci, Tiberiu", 648, 1, 81118612095, "Soft Cover");
		Console.WriteLine(myBook.title);
		Console.WriteLine(myBook.category);
		Console.WriteLine(myBook.author);
		Console.WriteLine(myBook.numPages);
		Console.WriteLine(myBook.currentPage);
		Console.WriteLine(myBook.ISBN);
		Console.WriteLine(myBook.coverStyle);
		myBook.nextPage();
		myBook.prevPage();
	}
}