View difference between Paste ID: ECpKY42E and FVcGVDB8

 class RomanNumber
     {
         /// <summary>
         /// The possible characters used to represent a single digit in a Roman number.
         /// Example: For tens digit, Ten = C (100), Five = L (50), One = X (10)
         /// </summary>
         class RomanDigit
         {
             public char Ten { get; set; }
             public char Five { get; set; }
             public char One { get; set; }
         }
 
         #region Constants
         static List<RomanDigit> RomanDigits = new List<RomanDigit>()
         {
             new RomanDigit() {Ten = 'X', Five = 'V', One = 'I'},    // Ones place
             new RomanDigit() {Ten = 'C', Five = 'L', One = 'X'},    // Tens place
             new RomanDigit() {Ten = 'M', Five = 'D', One = 'C'},    // Hundreds place
             new RomanDigit() {One = 'M'},                           // Thousands place
         };
         static int MAX = 3999;
         static int MIN = 0;
         #endregion
 
         /// <summary>
         /// Converts an Arabic number to a Roman number by converting one digit at a time.
         /// </summary>
         /// <param name="arabic"></param>
         /// <returns></returns>
         public static string ToRoman(int arabic)
         {
             if (arabic > MAX || arabic < MIN) throw new ArgumentOutOfRangeException("Arabic number must between 0 and 3999.");
             string roman = "";
 
             int decimalPlace = 0;   // Start at 10^0 (ones place)
             while (arabic > 0)
             {
                 // Get lowest digit
                 int currentDigit = arabic % 10;
 
                 // Add converted string to output
                 RomanDigit digit = RomanDigits[decimalPlace];
-                if (currentDigit % 5 == 4)  // Special case for 4 and 9
+                if (currentDigit % 5 == 4)  // Special case for 4 and 9, print "One" followed by "Five" or "Ten".
                     roman = string.Format("{0}{1}", digit.One, (currentDigit == 9) ? digit.Ten : digit.Five) + roman;
-                else
+                else // If currentDigit > 5, print "Five". Then print "One" several times until done.
                     roman = string.Format("{0}{1}", (currentDigit >= 5) ? digit.Five.ToString() : "", new String(digit.One, currentDigit % 5)) + roman;
 
                 // Next loop iteration
-                arabic /= 10;
+                arabic /= 10;    // Divide by 10 to get next digit
-                decimalPlace++;
+                decimalPlace++;  // Go to next RomanDigit
             }
 
             return roman;
         }
     }