These programs display a list of the names of single digits

backwards.cs

// This program outputs the names of a given list of digits backwards
//

string GetDigitName(int digit)
{
    switch(digit)
    {
        case 0: return "zero";
        case 1: return "one";
        case 2: return "two";
        case 3: return "three";
        case 4: return "four";
        case 5: return "five";
        case 6: return "six";
        case 7: return "seven";
        case 8: return "eight";
        case 9: return "nine";
        default:
            throw new ArgumentException(digit + "is not a digit.");
    }
}

List<int> digits = new List<int>(new int[]{0,1,2,3,4,5,6,7,8,9});

int index;
while(digits.Count > 0)
{
    index = digits.Count - 1;
    Console.WriteLine(GetDigitName(digits[index]));
    digits.RemoveAt(index);
}

random.cs

// This program outputs the names of a given list of digits in a random order
//

string GetDigitName(int digit)
{
    switch(digit)
    {
        case 0: return "zero";
        case 1: return "one";
        case 2: return "two";
        case 3: return "three";
        case 4: return "four";
        case 5: return "five";
        case 6: return "six";
        case 7: return "seven";
        case 8: return "eight";
        case 9: return "nine";
        default:
            throw new ArgumentException(digit + "is not a digit.");
    }
}

List<int> digits = new List<int>(new int[]{0,1,2,3,4,5,6,7,8,9});

Random rnd = new Random();
int index;
while(digits.Count > 0)
{
    index = rnd.Next(digits.Count);
    Console.WriteLine(GetDigitName(digits[index]));
    digits.RemoveAt(index);
}