using System;namespace PointerDemo{ public class PointerDemo { public static void Main() {  string s = "Hello Csharp!"; // 原字符串  Console.Write("the original string: ");  Console.WriteLine("{0}/r/n", s);  char[] b = new char[100];  s.CopyTo(0,b,0,13);  Console.Write("the encoded string: ");  // 使用不安全代碼  unsafe  {  // 加密過(guò)程  // 將字符串指針p指向字符數(shù)組b，并將參數(shù)p傳給函數(shù)  fixed(char *p = b) NEncodeDecode(p);  }  for(int i = 0; i < 13; i++)  Console.Write(b[i]);  Console.WriteLine("/r/n");   Console.Write("the decoded string: ");  unsafe  {  // 解密過(guò)程  fixed(char *p = b)NEncodeDecode(p);  }  for(int i = 0; i < 20; i++)  Console.Write(b[i]);  int t = 2;  t = t^5;  Console.WriteLine(t);  Console.WriteLine(); } // 對(duì)給定字符串進(jìn)行加密處理 unsafe public static void NEncodeDecode(char *s) {  int w;  for(int y = 0; y < 13; y++)  {  w = (int) *(s + y);  w = w^5; // 異或運(yùn)算  *(s + y) = (char)w;  } } }}