rearrange characters in a string

Question

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How do i move the character at the end of a string to the beginning of the string.

E.g

string a = "stack";

I want that string to be replaced with "kstac"

Thanx

Posted 25-Jun-12 4:13am

Raidzen10

Updated 25-Jun-12 5:22am

Toli Cuturicu

v2

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Tim Corey 25-Jun-12 10:18am

What have you tried? What is the context of this?

3 solutions

Solution 3

Try this :

C#

string s = "stack";
char[] cc = s.ToCharArray();
Array.Reverse(cc);
string rev = new string(cc);

Posted 25-Jun-12 4:17am

Mehdi Gholam

Comments

Tim Corey 25-Jun-12 10:19am

That would result in "kcats" but the OP wants "kstac".

Mehdi Gholam 25-Jun-12 10:26am

Right you are, reminds me of the research done where people read the first and last characters of words and make up the rest :)

Tim Corey 25-Jun-12 10:27am

:) Yep, it is easy to do.

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BoxyBrown · Accepted Answer · 2012-06-25T04:17:00

Solution 2

C#

string s = string.Format("{0}{1}", s.Substring(1, s.Length - 1), s[s.Length - 1]);

would be better

C#

string s = "stack";
int lengthOfMovingPart =  1;
s = string.Format("{0}{1}", s.Substring(s.Length - lengthOfMovingPart),s.Substring(0, s.Length - lengthOfMovingPart));

Posted 25-Jun-12 4:17am

BoxyBrown

Updated 25-Jun-12 6:28am

v4

Comments

Tim Corey 25-Jun-12 10:21am

Simple yet effective. Nice job.

Raidzen10 25-Jun-12 11:11am

Have you tried it? Does it return "kstac"?. Because i get "tackk".

BoxyBrown 25-Jun-12 11:45am

I think i've mistake with order of params. I'll check it now. Sorry

BoxyBrown 25-Jun-12 11:49am

s = string.Format("{0}{1}", s.Substring(s.Length - lengthOfMovingPart),s.Substring(0, s.Length - lengthOfMovingPart));

this is correct

DamithSL · Accepted Answer · 2012-06-25T04:43:00

You can simply use string Substring method for this. But you may need to handle when input string null or empty case and when string length is 1 as well.

Since already post answer with Substring method, here is a Linq solution.

C#

public string ProcessText(string input)
{
    if (!string.IsNullOrEmpty(input) && input.Length > 1)
    {
        return input.Last() + input.Remove(input.Length - 1);
    }
    return input;
}

rearrange characters in a string

3 solutions

Solution 2

Solution 4

Solution 3

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