Array Reserve

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SurfaceQuestion.Grammar
{
    public class ArrayReverse
    {
        public ArrayReverse()
        {
            int[] a = new int[] { 1, 2, 3, 4, 5, 6 };
            this.Way1(a);
            Console.WriteLine("_____________________");

            this.Way2(a);
            Console.WriteLine("_____________________");

            this.Way3(a);
        }

        /// <summary>
        /// 新数组
        /// </summary>
        private void Way1(int[] a)
        {
            int[] b = new int[a.Length];
            for (int i = 0; i < a.Length; i++)
            {
                Console.WriteLine("count:"+i);
                Console.Write(a[i]);
                b[i] = a[a.Length - 1 - i];
            }

            Console.WriteLine();
            foreach (var item in b)
            {
                Console.Write(item);
            }
        }

        /// <summary>
        /// 临时变量
        /// </summary>
        /// <param name="a"></param>
        private void Way2(int[] a)
        {
            foreach (var item in a)
            {
                Console.Write(item);
            }

            int temp = 0;
            for (int i = 0; i < a.Length/2; i++)
            {
                Console.WriteLine("count:" + i);

                temp = a[i];
                a[i] = a[a.Length - 1 - i];
                a[a.Length - 1 - i] = temp;
            }

            Console.WriteLine();
            foreach (var item in a)
            {
                Console.Write(item);
            }
        }

        /// <summary>
        /// while
        /// mscorlib实现方式
        /// </summary>
        /// <param name="a"></param>
        private void Way3(int[] a)
        {
            foreach (var item in a)
            {
                Console.Write(item);
            }

            int num = 0;
            int num2 = a.Length - num - 1;
            while (num2 > num)
            {
                Console.WriteLine("count:" + num);

                int temp = a[num];
                a[num] = a[num2];
                a[num2] = temp;
                num++;
                num2--;
            }

            Console.WriteLine();
            foreach (var item in a)
            {
                Console.Write(item);
            }
        }
    }
}