static void Main(string[] args)
{
isbn myFavoriteBook = new isbn();
bool isValid = CheckDigit.CheckIsbn(myFavoriteBook.GetIsbn());
Console.WriteLine(string.Format("Your book {0} a valid ISBN",
isValid ? "has" : "doesn't have"));
Console.ReadLine();
}
static void Main(string[] args)
{
//create a new instance of the ISBN/book class. you're prompted as part
//of the constructor.
isbn myFavoriteBook = new isbn();
//new class contains the method for checking validity
bool isValid = CheckDigit.CheckIsbn(myFavoriteBook.GetIsbn());
//write out the results of the validity.
Console.WriteLine(string.Format("Your book {0} a valid ISBN",
isValid ? "has" : "doesn't have"));
Console.ReadLine();
}