public void EnumeratePreviousNumber(out int outputNumber, ref double sum)
{
int lastOutputNumber = (int)OutputNumbers.LastOrDefault();
RemoveLastElement();
sum += Math.Pow(lastOutputNumber, 2);
outputNumber = lastOutputNumber - 1;
if (!CheckIfOutputNumberIsCorrect(outputNumber) && OutputNumbers.Count == 0)
{
outputNumber = -1;
}
else if (!CheckIfOutputNumberIsCorrect(outputNumber))
{
EnumeratePreviousNumber(out outputNumber, ref sum);
}
}
public void EnumeratePreviousNumberWhenAllMembersFound(out int outputNumber, ref double sum)
{
sum += Math.Pow(OutputNumbers.LastOrDefault(), 2);
RemoveLastElement();
EnumeratePreviousNumber(out outputNumber, ref sum);
}