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Posted 16 Jun 2007

Count with Letters

, 16 Jun 2007
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A way to use letters instead of numbers to count


I had to write a "text tool" application a few days ago, and one of the requests was to "number" text lines with letters (like Microsoft Word does from bullets and numbering). Because I couldn't find an "already made" function for this, I had to do it myself. It's not difficult - this article is for beginner's (plus) level.


To understand this function, all you need is to have basic knowledge of C# (to know the char type, the string type and to understand how to convert between these types).

Using the Code

This code is free. You can use and redistribute. You can improve it (because it is not perfect).

The code

The function is like this:

private string GetNext(string current) 
{return curent + 1; // the next value}

Let's say that current = "a", then, the return will be "b". If the current = "z", the return will be "aa". If current = "abcd" the return is "abce" and so on.

To do this, I need 2 auxiliary functions:

private char GetNextChar(char c)
	if (c < 'z')
		return (char)((int)c + 1);
		return 'a'; 


private string ReverseString(string str)
	StringBuilder sb = new StringBuilder();
	for (int i = str.Length - 1; i >= 0; i--)
	return sb.ToString();

The ReverseString function is only because I feel more comfortable to work with the string from left to right.

The main function is:

private string GetNext(string curent)
	string next = "";
	int depl = 0;
	curent = ReverseString(curent);
	char curent_digit;

	curent_digit = GetNextChar(curent[0]);
	if (curent_digit < curent[0])
		depl = 1;
		depl = 0;
	next = curent_digit.ToString();
	for (int i = 1; i < curent.Length; i++)
		curent_digit = curent[i];
		if (depl != 0)
			curent_digit = GetNextChar(curent[i]);
			if (curent_digit < curent[i])
				depl = 1;
				depl = 0;
		next += curent_digit.ToString();
	if (depl == 1)
		next += 'a'.ToString();
	return ReverseString(next);

As an example of usage for this:

private void btnNext_Click(object sender, EventArgs e)
	string s = txtCurent.Text;
	StringBuilder tmp = new StringBuilder();
	for (int i = 0; i < 10000; i++)
		s = GetNext(s);
	lblLast.Text = s.ToString();

A form, with a button and a textbox (with multiline = true) to see the result.


  • 17th June, 2007: Initial post


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Israel Israel
No Biography provided

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Comments and Discussions

GeneralMy vote of 1 Pin
Michael Ascker20-Jan-11 13:26
memberMichael Ascker20-Jan-11 13:26 
General[My vote of 2] My vote of 2 Pin
Rajkumar-Kannan28-Feb-10 17:45
memberRajkumar-Kannan28-Feb-10 17:45 
GeneralRe: [My vote of 2] My vote of 2 Pin
zeltera28-Feb-10 19:50
memberzeltera28-Feb-10 19:50 
GeneralMy vote of 1 Pin
BillWoodruff26-Dec-09 19:28
memberBillWoodruff26-Dec-09 19:28 
GeneralLetter arithmetic Pin
djlove21-Jun-07 7:23
memberdjlove21-Jun-07 7:23 
GeneralPosible extension for this application Pin
zeltera20-Jun-07 0:25
memberzeltera20-Jun-07 0:25 
GeneralString + Integer Pin
Steve Hansen18-Jun-07 4:11
memberSteve Hansen18-Jun-07 4:11 
GeneralRe: String + Integer Pin
zeltera18-Jun-07 4:21
memberzeltera18-Jun-07 4:21 
GeneralRe: String + Integer Pin
zeltera18-Jun-07 4:30
memberzeltera18-Jun-07 4:30 
GeneralRe: String + Integer Pin
Steve Hansen18-Jun-07 6:22
memberSteve Hansen18-Jun-07 6:22 
GeneralRe: String + Integer Pin
zeltera18-Jun-07 7:13
memberzeltera18-Jun-07 7:13 
GeneralActually... Pin
sharpiesharpie17-Jun-07 2:00
membersharpiesharpie17-Jun-07 2:00 
GeneralRe: Actually... Pin
zeltera17-Jun-07 2:12
memberzeltera17-Jun-07 2:12 
GeneralRe: Actually... [modified] Pin
sharpiesharpie17-Jun-07 2:56
membersharpiesharpie17-Jun-07 2:56 
GeneralRe: Actually... Pin
Kamarey17-Jun-07 11:04
memberKamarey17-Jun-07 11:04 
GeneralRe: Actually... Pin
zeltera17-Jun-07 11:38
memberzeltera17-Jun-07 11:38 
GeneralRe: Actually... Pin
Kamarey19-Jun-07 6:17
memberKamarey19-Jun-07 6:17 
GeneralRe: Actually... Pin
djlove20-Jun-07 0:15
memberdjlove20-Jun-07 0:15 
GeneralRe: Actually... Pin
Kamarey20-Jun-07 3:19
memberKamarey20-Jun-07 3:19 

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