private static void EnterGrades(IBook book)
{
string input = "";
double grade = 0.0;
bool IsDouble = false;
while (input.ToUpper() != "Q")
{
Console.WriteLine("Please Enter Grade or Q for exit :");
input = Console.ReadLine();
IsDouble = double.TryParse(input, out grade);
if (IsDouble)
{
book.AddToTextFileGrades(grade);
}
}
}
