static void Main(string[] args)
{
var book = new Diskbook("Nagaraj's Book module checks");
book.GradeAdded += OnGradeAdded;//calling the delegate
EnterGrades(book);
var stats = book.GetStatistics();
Console.WriteLine($"The module is {book.Name}");
Console.WriteLine($"The lowest grade is {stats.Low}");
Console.WriteLine($"The highest grade is {stats.High}");
Console.WriteLine($"The average grade is {stats.Average:N1}");
Console.WriteLine($"The letter grade is {stats.Letter}");
}
static void Main(string[] args)
{
IBook book = new Diskbook("Dallas GradeBook Practice");
book.GradeAdded += OnGradeAdded;
EnterGrades(book);
var stats = book.GetStatistics();
Console.WriteLine($"For the book named {book.Name}");
Console.WriteLine($"The lowest grade is {stats.Low}");
Console.WriteLine($"The highest grade is {stats.High}");
Console.WriteLine($"The average grade is {stats.Average:N1}");
Console.WriteLine($"The letter grade is {stats.Letter}");
}