public static bool IsRampNumber(long number)
{
var digits = DerpMath.DigitsArray(number);
// Iterate only to the second last digit as we need to compare it to the next digit.
int checkIndex = digits.Length - 1;
for (int i = 0; i < checkIndex; i++)
{
byte currDigit = digits[i];
byte nextDigit = digits[i + 1];
if (currDigit > nextDigit)
{
return(false);
}
}
return(true);
}
public static byte[] DigitsArray(long number)
{
int length = DerpMath.DigitCount(number);
long positiveNumber = Math.Abs(number);
var digits = new byte[length];
long processedNumber = positiveNumber;
int digitIndex = 0;
for (int i = 0; i < length; i++)
{
digitIndex = (length - 1) - i;
byte digit = (byte)(processedNumber % 10);
digits[digitIndex] = digit;
processedNumber /= 10;
}
return(digits);
}
static void Main(string[] args)
{
if (args.Length < 1)
{
PrintError("No number given.");
return;
}
long numberRange;
if (!long.TryParse(args[0], out numberRange))
{
PrintError("That's not a number or it's a too big number. :C");
return;
}
long start;
long stop;
if (numberRange >= 0)
{
start = 0;
stop = numberRange;
}
else
{
start = numberRange + 1;
stop = 1;
}
int count = 0;
for (long n = start; n < stop; n++)
{
if (DerpMath.IsRampNumberFaster(n))
{
count++;
//Debug.WriteLine(rampNumber, "rampNumber");
}
}
//Debug.WriteLine(count, "count");
Console.WriteLine(count);
}