帮我看个简单的问题

Question

string a="123456789";
怎么样在不消耗内存的情况下 使得a="987654321";

Answer 1

不消耗内存?
string a = "123456789";反向输出算不算？

Answer 2

new string(a.ToCharArray().Reverse().ToArray());

Answer 3

a.toarray().reserve().tostring,思路...转变成数据后倒置再转变回来试试

Answer 4

/// <summary>
        /// 反转字符串
        /// </summary>
        /// <param name="str">原始字符串</param>
        /// <returns>反转后的字符串</returns>
        public static string ReverseString(string str)
        {
            char[] chars = str.ToCharArray();
            Array.Reverse(chars);
            return new string(chars);
        }

Answer 5

class Program
    {
        static void Main(string[] args)
        {            string a = "123456789";
            string str = "";
           
            string[] arr=new string[a.Length] ;            for (int i = 8; i < a.Length; i--)
            {
                if (i >= 0)
                {
                    arr[i] = a.Substring(i, 1);                    str = str + arr[i];
                }
                else
                {
                    break;
                }
            }
            Console.WriteLine(str);
            Console.ReadLine();
            
           
            
        }
    }

Answer 6

绝对要消耗内存和CPU的方法string a="123456789";
a = new string(Array.Reverse(a.ToCharArray()));