Question

How to swap pairs of characters in a string with C#

Answer 1

using System;

public class Program
{
	public static string SwapPairs(string str) {
		if (str.Length == 0) {
			return str;
		}

		char[] arr = str.ToCharArray();

		for (int i = 0; i < arr.Length - 1; i += 2) {
			char tmp = arr[i];
			arr[i] = arr[i + 1];
			arr[i + 1] = tmp;
		}

		return new string(arr);
	}
	public static void Main(string[] args)
	{
		string str = "aBcDeFgHiJkL";

		Console.WriteLine(SwapPairs(str));
	}
}




/*
run:
 
BaDcFeHgJiLk
 
*/

 

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