static void Main(string[] args)
{
PhoneNumber phoneNumber = new PhoneNumber();
int number = 9;
while (phoneNumber.DigitCount < 7)
{
phoneNumber.TryAdd(new Key(number, null));
number--;
}
Console.WriteLine(phoneNumber);
}
public List<PhoneNumber> GetNumbersStartingFrom(int startDigit)
{
var accruedNumbers = new List<PhoneNumber>();
if (!PhoneNumber.IsValidStartDigit(startDigit))
return accruedNumbers.ToList();
var number = new PhoneNumber();
if (number.TryAdd(startDigit))
{
AddToDigitSequence(accruedNumbers, number);
}
return accruedNumbers.Where(c => c.DigitCount == 7).ToList();
}
