Swap Adjacent letters in a word

Question

Ex:LONDON ->OLDNNO

Answer 1

try this:

StringBuilder builder = new StringBuilder();
string s = "LONDON";

for (int i = 1; i < s.Length; i += 2)
{
builder.Append(s[i]);
builder.Append(s[i - 1]);
}

if (s.Length % 2 == 1)
builder.Append(s.Last()); // if the string has an odd number of characters we
add the last character (which was not swapped)

Console.Write(builder.ToString());

Answer 2

Thank you very much .. it's working ....