private static void EnterGrade(IBook book)
{
while (true)
{
Console.WriteLine("Enter a grade or press q to exit");
var input = Console.ReadLine();
if (input == "q")
{
break;
}
try
{
var grade = double.Parse(input);
book.Addgrade(grade);
}
catch (ArgumentException ex)
{
Console.WriteLine(ex.Message);
}
catch (FormatException ex)
{
Console.WriteLine(ex.Message);
}
//finally
//{
// Console.WriteLine("/**/");
//}
}
}