Hi,
<snip>
[color=blue]
> The only reason I didn't use char is that I'm performing an addition
> operation with the char.[/color]
The increment operator (++) works on a char. And you can compare char with
other chars.
The following code is like yours except for the conversion:
public const char MIN_CHAR='A';
public const char MAX_CHAR='Z';
public static string BuildNextAlphabeticCode(string current)
{
StringBuilder ret = new StringBuilder(current);
bool CA = true; // cary one
int digit = ret.Length-1;
while ( (CA) && (digit>=0) )
{
char c = start[digit];
if ( ++c > MAX_CHAR )
{
ret[digit] = MIN_CHAR;
CA = true;
}
else
{
ret[digit] = c;
CA = false;
}
--digit;
}
// handle possible overflow
if (CA) ret.Insert(0,MIN_CHAR);
return ret.ToString();
}
HTH,
Greetings
[color=blue]
> Basically, I'm generating incrementing a string like the column numbering
> system in Excel. A,B,C...,Z,AA,AB,AC...,AZ,AAA....
>
> This may not be the best way, but it now works.
>
> /// <summary>
> /// Take a string generated by this sub, and figure the next logical
> /// item in the series.
> /// </summary>
> /// <param name="current">The string we are 'incrementing' </param>
> /// <returns>The next string in the series. Ex: A returns B, CC returns
> CD, ZZ returns AAA</returns>
> public static string BuildNextAlphabeticCode(string current)
> {
> //Convert argument to array of ints
> int[] codes = General.StringHelp.UnicodeValues(current);
> bool done = false;
>
> for(int i = codes.GetUpperBound(0); i >= codes.GetLowerBound(0); i--)
> {
> int incremented = codes[i] + 1;
> if(incremented <= MAX_CHAR_CODE)
> {
> codes[i] = incremented;
> done = true;
> break;
> }
> else
> {
> //set this one back to min char code
> codes[i] = CAP_A_CHAR_CODE;
> }
> }
> //convert back to string
> char[] chars = new char[codes.GetUpperBound(0)];
> StringBuilder sb = new StringBuilder();
> for(int j = codes.GetLowerBound(0); j <= codes.GetUpperBound(0); j++)
> {
> sb.Append(Convert.ToChar(codes[j]));
> }
> if(!done)
> {
> //The string needs to be one character longer.
> //add a character
> //CAP_A_CHAR_CODE;
> sb.Append(Convert.ToChar(CAPA_CHAR_CODE));
> }
> return sb.ToString();
> }
>
> Is there a much better way?
>
> Thanks for the reply,
> Eric
>
>[/color]
