using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace 循环左移 {     class Program     {          static string reverse(  char[] char2, int i, int j)         {             for (int begin=i,end=j;begin < end; begin++, end--)             {                 char temp = char2[begin];                 char2[begin] = char2[end];                 char2[end] = temp;             }             return new String(char2);         }         static string leftshift( string str,int i ,int j)         {             char[] char1 = str.ToCharArray();             reverse( char1,0,i-1);             reverse( char1,i,j-1);             reverse( char1, 0, j - 1);             return new String(char1);         }         static void Main(string[] args)         {             Console.WriteLine("请输入一个字符串：");             string mystring = Convert.ToString(Console.ReadLine());             int length = mystring.Length;             Console.WriteLine("请输入你要左移的位数，不要超过字符串长度"+length);             int N = Convert.ToInt32(Console.ReadLine());             String str=leftshift(mystring, N, length);             Console.WriteLine(str);             Console.WriteLine();             Console.ReadKey();         }     } }