1.3.9.4

using System;

namespace ConsoleApplication
{
    class Program
    {
        /*
         * Сделайте 3 метода:
         *  - Удаление элемента из массива.
         *  - Добавление элемента в массив.
         *  - Перенос одного массива в другой.
         */

        static void Main ( string [] args )
        {
            int [] nums = new int [4] { 1,2,3,4 };
            int [] nums2 = Transfer ( nums );
            foreach ( int i in nums2 )
            {
                Console.WriteLine ( i );
            }
        }

        static int [] Delete ( int [] arr )
        {
            int [] newArray;

            if ( arr.Length > 1 )
            {
                newArray = new int [arr.Length - 1];

                for ( int i = 0 ; i < newArray.Length ; i++ )
                {
                    newArray [i] = arr [i];
                }
                return newArray;
            }

            else
            {
                newArray = new int [1];
                newArray [0] = 0;
                return newArray;
            }
        }

        static int [] Add ( int [] arr )
        {
            int [] newArray = new int [arr.Length + 1];

            for ( int i = 0 ; i < newArray.Length ; i++ )
            {
                if ( i < arr.Length )
                {
                    newArray [i] = arr [i];
                }
                else
                {
                    newArray [i] = 0;
                }
            }

            return newArray;
        }

        static int [] Transfer ( int [] arr )
        {
            int [] newArray = new int [arr.Length];

            for ( int i = 0 ; i < newArray.Length ; i++ )
            {
                newArray [i] = arr [i];
            }
            return newArray;
        }
    }
}