How to increase string character value

[T Willey]

Say you have a variable named "Str" and it's value is "A", how would you change it to "B" not knowing which letter to start at? Could you use the same method for strings that represent numbers also? I have searched the net and haven't found an answer. Thanks in advance.

Tim

[Lost User]

string test = "A";

test = string.Format("{0}", (char)(test[0] + 1));

=> test = "B" This will work, if your value is an ASCII char. It's converted to an int, increased by 1 and converted back to a char regards

[Michael Potter]

This will convert a full string. You will end up with some punctuation at the end of the alphabit.

string oldStr = "Hello";
string newStr = "";
char[] hold = oldStr.ToCharArray();
for (int i = 0; i < hold.Length; i++)
{
    newStr += (char)(hold[i] + 1);
}
MessageBox.Show(oldStr + Environment.NewLine + newStr);

[T Willey]

I think all my values will be ASCII char's right now. Thank you.

Tim

[T Willey]

Thanks for the code Michael.

Tim

[Guffa]

Actually it works for any character, but it's not very meaningful for all characters.

--- b { font-weight: normal; }

[mihoc]

Here's a small recursive code for increasing a string. It's for increasing through Excel columns, so it also increases strings like "AD" or "ZZ". Use the method IncString:

private string IncString(string s)
{
if (String.IsNullOrEmpty(s)) return "A";
if (s[s.Length - 1] == 'Z')
{
if (s.Length == 1) return "AA";
else return IncString(s.Substring(0, s.Length - 1)) + "A";
}
else
{
if (s.Length == 1) return IncChar(s[0]).ToString();
else return s.Substring(0, s.Length - 1) + IncChar(s[s.Length - 1]).ToString();
}
}

    private char IncChar(char c)
    {
        return (char)((int)c + 1);
    }