how to swap characters in a string

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Hi all.
I'm new in .Net and i want to learn.
My question is how to change characters in string. Was trying to find solution on google, but i couldn't find it.
For example: how to change string "abcd" in "badc".

I can swap first 2 characters, but i dont have idea how to change others.
This is how i done that:

C#

static string Swap(string str, int index1, int index2)
        {
            char[] c = str.ToCharArray();
            char temp = c[index1];
            c[index1] = c[index2];
            c[index2] = temp;

            return new string(c);
        }

Plz can someone help me.
Thx.

Posted 2-Sep-11 3:32am

blink_Lom

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4 solutions

Solution 1

Use Loop and find odd positions and swap with one incremented even position eg: 1 with 2 and vice versa 3 by 4 and so on. use the same logic which u have written but apply the loop by calculating the length of ur string.

Posted 2-Sep-11 3:40am

Anuja Pawar Indore

Solution 2

I posted a tip/trick about how to do this, but this damn iPad is truncating the link. You're gonna have to search the site for it unless someone else is willing to post it (or I get home from my errands).

EDIT =======================

Extension Methods to Reverse a String and StringBuilder Object[^]

Posted 2-Sep-11 3:45am

#realJSOP

Updated 2-Sep-11 4:33am

v2

Comments

Marcus_2 2-Sep-11 10:06am

http://www.codeproject.com/Tips/230232/Reverse-of-a-String-without-using-Function-in-Csha At least I think thats the one you mean.

#realJSOP 2-Sep-11 10:34am

Nope - I posted it when I got home.

Solution 4

Another option,

C#

static void Main(string[] args)
{
    string myString = "Hello world";
    Console.WriteLine(ReverseString(myString));
}

static string ReverseString(string @string)
{
    return new string(@string.Reverse().ToArray());
}

:)

Posted 8-Sep-11 20:17pm

Mohammad A Rahman

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RaisKazi · Accepted Answer · 2011-09-02T04:17:00

Try as below code.

C#

string input = "AXBYCZ";
StringBuilder output = new StringBuilder();

char[] characters = input.ToCharArray();
        
for (int i = 0; i < characters.Length; i++)
{
  if (i % 2 == 0)
  {
    if((i+1) < characters.Length )
    {
      output.Append(characters[i + 1]);
    }
               output.Append(characters[i]);
  }

}

Input: "AXBYCZ"
Output: "XAYBZC"

Incase length of string is odd number. Then last character will maintain its original position.

Input: "AXBYCZT"
Output: "XAYBZCT"