Question

********************C# C# C#********************

Part A: Create a project with a Program class and write the following two methods(headers provided) as described below:

1. A Method, public static int InputValue(int min, int max), to input an integer number that is between (inclusive) the range of a lower bound and an upper bound. The method should accept the lower bound and the upper bound as two parameters and allow users to re-enter the number if the number is not in the range or a non-numeric value was entered.

2. A Method, public static bool IsValid(string id), to check if an input string satisfies the following conditions: the string’s length is 5, the string starts with 2 uppercase characters and ends with 3 digits. For example, “AS122” is a valid string, “As123” or “AS1234” are not valid strings.

Part B: Create a Book class containing the following:

1. Two public static arrays that hold codes (categoryCodes) and descriptions of the popular book categories (categoryNames) managed in a bookstore. Thesecodes are CS, IS, SE, SO, and MI, corresponding to book categories Computer Science, Information System, Security, Society and Miscellaneous.

2. Data fields for book id (bookId) and book category name   (categoryNameOfBook)

3. Auto-implemented properties that hold a book’s title (BookTitle), book’s number of pages (NumOfPages) and book’s price (Price).

4. Properties for book id and book category name. Assume that the set accessor will always receive a book id of a valid format. For example, “CS125” and “IS334” are of valid format and also refer to known categories “Computer Science” and “Information Systems”. If the book ID does not refer to a known category, then the set accessor must retain the number and assign to the “MI” category. For example, “AS123” will be assigned as “MI123”. The category property is a read-only property that is assigned a value when the book id is set.

5. Two constructors to create a book object:

- one with no parameter:

public Book()

- one with parameter for all data fields:

public Book(string bookId, string bookTitle, int numPages, double price)

6. A ToString method, public override string ToString(), to return information of a book object using the format given in the screen shot under

Information of all Books

Part C:

Extend the application in Part A (i.e., adding code in the Program class) to become a BookStore Application by making use of the Book class and completing the following tasks:

1. Write a Method,

  private static void GetBookData(int num, Book[] books),

to fill an array of books. The method must fill the array with Books which are constructed from user input information (which must be prompted for). Along with the prompt for a book id, it should display a list of valid book categories and call method in Part A.2 to make sure the inputted book id is a valid format. If not the user is prompted to re-enter a valid book id.

2. After the data entry is complete, write a Method,

public static void DisplayAllBooks(Book[] books),

to display information of all books that have been entered including book id, title, number of pages and price. This method should call the ToString methodthat has been created in Book class.

3. After the data entry is complete, write a Method,

private static void GetLists(int num, Book[] books),

to display the valid book categories, and then continuously prompts the user for category codes and displays the information of all books in the category as well as the number of books in this category.

Appropriate messages are displayed if the entered category code is not a valid code.

4. Write the Main method that first prompts the user for the number of books that is between 1 and 30 (inclusive), by calling the method in Part A.1.

Then call method in Part C.1 to create an array of books.

Then call method in Part C.2 to display all books in the array.

Then call method in Part C.3 to allow the user to input a category code and see information of the category.

Answer 1

Hi please find the below c# code

// book class
class Book
{
// two static array contains the categorycode and categoryname respectively
public static String[] categoryCodes = { "CS", "IS", "SE", "SO", "MI" };
public static String[] categoryNames = { "Computer Science", "Information System", "Security", "Society", "Miscellaneous" };
// fields for price, booktitle, categoryNameOfBook, NumOfPages, bookId
public double Price { get; set; }
public string BookTitle { get; set; }
public string categoryNameOfBook { get; set; }
public int NumOfPages { get; set; }
public string bookId
{
get;
set;
  
}
// constructor without parameters
public Book()
{

}
// constructor with parameters
public Book(string bookId, string bookTitle, int numPages, double price)
{

this.BookTitle = bookTitle;
this.NumOfPages = numPages;
this.Price = price;
// add category and retieve information from bookId
var subId = bookId.Substring(0, 2);
// check whether the first two charachter are in categorycode array or not
if (categoryCodes.Contains(subId))
{
// take the index from categoryCode
int index = Array.IndexOf(categoryCodes, subId);
this.categoryNameOfBook = categoryNames[index];
this.bookId = bookId;
}
else
{
// create new code ie. bookId to use as MI as specifed in the question
var newCode = "MI" + bookId.Substring(2);
this.bookId = newCode;
this.categoryNameOfBook = "Miscellaneous";
}

}

// tostring method to return the current object information
public override string ToString()
{
return $"Book Id {this.bookId}, Book Title {this.BookTitle}, Number of Pages {this.NumOfPages}, Price {this.Price} ";
}
}

// program class
class Program
{
// A Method, public static int InputValue(int min, int max),
//to input an integer number that is between (inclusive) the range of a lower bound
//and an upper bound. The method should accept the lower bound and the upper bound as two
//parameters and allow users to re-enter the number if the number is not in the range or a non-numeric value was entered
public static int InputValue(int min, int max)
{
int value = 0;
Console.WriteLine($"Please enter an int between {min} and {max}");
while (true)
{
var isInt = int.TryParse(Console.ReadLine(), out value);
if (value > min && value < max)
break;
}
return value;
}

// A Method, public static bool IsValid(string id), to check if an input
//string satisfies the following conditions: the string’s length is 5,
//the string starts with 2 uppercase characters and ends with 3 digits.
public static bool IsValid(string id)
{
// check for length
if (id.Length != 5)
return false;
int i = 1;
// iterate to check the uppercase for two characters
foreach (char c in id)
{
if (i < 3 && !char.IsUpper(c))
{
return false;
}
if (i > 2)
break;
i++;
}
// use int.tryparse to check whether last three characters are digits and store the reult in value
if (!int.TryParse(id.Substring(2), out i))
return false;
return true;
}

// create an array by taking the information from user
private static void GetBookData(int num, Book[] books)
{
// display valid ids
Console.WriteLine($"Valid Book Ids AS122, MI112, SO132, SE123");

for (int i = 0; i < num; i++)
{
string bookId = "";
// looping till the valid BookId is not entered
while (true)
{
Console.WriteLine("Plese enter BookId");
bookId = Console.ReadLine();
if (IsValid(bookId))
{
// break when valid bookid is enetered
break;
}
}
Console.WriteLine("Please enter the book title");
var bookTitle = Console.ReadLine();
Console.WriteLine("Please enter Number of Pages");
var pages = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Please enter Price");
var price = Convert.ToDouble(Console.ReadLine());
// take all the information from user and store it to current index of books array
books[i] = new Book(bookId, bookTitle, pages, price);
}
}

// display all books using to string method
public static void DisplayAllBooks(Book[] books)
{
for (int i = 0; i < books.Length; i++)
{
Console.WriteLine(books[i].ToString());
}
}

// getlists method to display the informaion on the basis of category code
private static void GetLists(int num, Book[] books)
{
Console.WriteLine($"Book Catergory Codes {String.Join(",", Book.categoryCodes)}");
Console.WriteLine($"Please Enter Category Code");
string code = "";
// looping till the valid Code is not entered
while (true)
{
code = Console.ReadLine();
if (Book.categoryCodes.Contains(code))
{
break;
}
else
{
Console.WriteLine("Please enter a valid code");
}
}
// take the index of book code
int index = Array.IndexOf(Book.categoryCodes, code);
var categoryName = Book.categoryNames[index];
// get the book array using categoryname
var book = books.Where(b => b.categoryNameOfBook == categoryName).ToList();

// display the count
Console.WriteLine($"Total number of book for the category {categoryName} are {book.Count}");

if (book.Count > 0)
Console.WriteLine($"Book details are follows");
// display the new book array information
foreach (var b in book)
{
Console.WriteLine(b.ToString());
}

}

// main function
static void Main(string[] args)
{
// first prompts the user for the number of books that is between 1 and 30
int num = InputValue(1, 30);
//call method in Part C.1 to create an array of books.
Book[] books = new Book[num];
GetBookData(num, books);
//call method in Part C.2 to display all books in the array.
DisplayAllBooks(books);
//call method in Part C.3 to allow the user to input a category code and see information of the category.
GetLists(num, books);

} }

OUTPUT: I have entered information for four books

As we can see there are two books which fall under SO category

Thanks

Hope it helps!!