using System;

namespace SwapElements

{

​

    public class Numbers

    {

        private int[] num;

​

        public int getLength()

        {

            return num.Length;

        }

​

        public Numbers()

        {

            num = new int[5];

        }

​

        public int getNum(int index)

        {

            return num[index];

        }

​

        public void setNum(int index, int val)

        {

            num[index] = val;

        }

​

        public void swap()

        {

            int temp;

            for (int i = 0; i < num.Length - 1; i++)

            {

                if (i % 2 == 0)

                {

                    temp = num[i];

                    num[i] = num[i + 1];

                    num[i + 1] = temp;

                }

            }

        }

    }

​

​

​

    public class Program

    {

        public static void Main(string[] args)

        {

            Numbers num = new Numbers();

            Console.Write("Input 5 Numbers: ");

            for (int i = 0; i < num.getLength(); i++)

            {   

​

                num.setNum(i, Convert.ToInt32(Console.ReadLine()));

            }

​

            num.swap();

​

            Console.WriteLine("\nAfter Swap:");

            for (int i = 0; i < 5; i++)

            {

                Console.Write("{0} ", num.getNum(i));

            }

            Console.WriteLine();

        }

    }

}