System.__DTString.GetDigit C# (CSharp) Method

        internal int GetDigit() {
            BCLDebug.Assert(Index >= 0 && Index < len, "Index >= 0 && Index < len");
            BCLDebug.Assert(DateTimeParse.IsDigit(Value[Index]), "IsDigit(Value[Index])");
            return (Value[Index] - '0');
        }

		private static bool ParseFractionExact(ref __DTString str, int maxDigitLen, ref double result)
		{
			if (!str.GetNextDigit())
			{
				str.Index--;
				return false;
			}
			result = (double)str.GetDigit();
			int i;
			for (i = 1; i < maxDigitLen; i++)
			{
				if (!str.GetNextDigit())
				{
					str.Index--;
					break;
				}
				result = result * 10.0 + (double)str.GetDigit();
			}
			result /= Math.Pow(10.0, (double)i);
			return i == maxDigitLen;
		}