logics programing

Thank you sir for ur help

Hi Jaya

Try Following Code, you can get your output

Code 1 :

Console.WriteLine("Enter a string : ");
string sS = Console.ReadLine();
string sss = "";

for (int i = 0; i < sS.Length; i = i + 2)
{
    if((i+1) < sS.Length)
    {
        sss += sS[i + 1];
    }
    sss += sS[i];
}
Console.WriteLine(sss);

Code 2 :

Console.WriteLine("Enter a string : ");
string sS = Console.ReadLine();
string sss = "";
int i = 0;

for (i = 0; i < sS.Length-1; i = i + 2)
{
   sss += sS[i + 1];
   sss += sS[i];
}
sss += sS[i];
Console.WriteLine(sss);

Hi Jaya Prakash,

Please find below and try to debug and understand,

string input = "Tapan"; //Sample String
string output = string.Empty;
char[] characters = input.ToCharArray();

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