c#:输入5个字符，将其倒序打印出来

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using System;using System.Collections.Generic;using System.Linq;using System.Text;//运用所学知识，输入5个字符，将其倒序打印出来namespace ans2{    class Program    {        static void Main(string[] args)        {            string s = Console.ReadLine();            int len = s.Length;            while(len != 5)            {                s = Console.ReadLine();                len = s.Length;            }            for (int i =len-1; i>=0; i--)            {                Console.Write("{0}",s[i]);            }            Console.WriteLine();        }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;//运用所学知识，输入5个字符，将其倒序打印出来namespace ans2{    class Program    {        static void Main(string[] args)        {            string s;            int len;                       while(true)            {                s = Console.ReadLine();                len = s.Length;                if (len == 5)                    break;            }            for (int i =len-1; i>=0; i--)            {                Console.Write("{0}",s[i]);            }            Console.WriteLine();        }    }}

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using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            char[] ch = new char[5];            Console.WriteLine("请输入字符（用回车间隔）：");            for (int i = 0; i < 5; i++)            {                ch[i] = Convert.ToChar(Console.ReadLine());                //ch[i] = Char.Parse(Console.ReadLine());这一句也可以转换为字符            }            Console.Write("倒序输出为：");            for (int i = ch.Length - 1; i >= 0; i--)            {                Console.Write(ch[i]);            }            Console.ReadLine();        }    }}

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