static void Main(string[] args)
{
Book book = new Book("Ade");
while (true)
{
Console.WriteLine("Please enter grade or 'q' to quit: ");
var gradeInput = Console.ReadLine();
try{
var gradeInt = double.Parse(gradeInput);
book.AddGrades(gradeInt);
}catch (Exception FormatException) {
Console.WriteLine(FormatException.Message);
}
if (gradeInput == "q")
{
break;
}
}
book.DisplayStatisticsSummary();
}
