给定以下XML文件，完成算法流程图。

 

  
  
  

   
   
   
   
   
   <
   
   
   FileSystem
   
   
   >
   
   
    

   
   
   <
   
   
    DriverC 
   
   
   >
   
   
    

   
   
   <
   
   
   Dir 
   
   
   DirName
   
   
   =”MSDOS622”> 

   
   
   <File FileName 
   
   
   =” 
   
   
   Command.com” 
   
   
   ></
   
   
   File
   
   
   >
   
   
    

   
   
   </
   
   
   Dir
   
   
   >
   
   
    

   
   
   <
   
   
   File 
   
   
   FileName 
   
   
   =”MSDOS.SYS” 
   
   
   ></
   
   
   File
   
   
   >
   
   
    

   
   
   <
   
   
   File 
   
   
   FileName 
   
   
   =” 
   
   
   IO.SYS” 
   
   
   ></
   
   
   File
   
   
   >
   
   
    

   
   
   </
   
   
   DriverC
   
   
   >
   
   
    

   
   
   </
   
   
   FileSystem
   
   
   >
   
   
    

  
  
  

 

请画出遍历所有文件名（FileName）的流程图(请使用递归算法)。
答：

 

  
  
  

   
   
   
   
   
   void
   
   
    FindFile( Directory d ) 
{ 
 FileOrFolders 
   
   
   =
   
   
    d.GetFileOrFolders(); 

   
   
   foreach
   
   
   ( FileOrFolder fof 
   
   
   in
   
   
    FileOrFolders ) 
 { 

   
   
   if
   
   
   ( fof 
   
   
   is
   
   
    File ) 
 You Found a file; 

   
   
   else
   
   
    
   
   
   if
   
   
    ( fof 
   
   
   is
   
   
    Directory ) 
 FindFile( fof ); 
 } 
}