In class Design

main
  
   Open the traction file
   Read in a file name
   while there are files to process
       Process the file
	   Read in a new file name
    Close all files
	

Question: What if the input file does not exist?
   Ask the customer.
   
OpenTransactionFile()
   Input: none
   Output: the open file stream.
   
   file open operation
   
ReadFileName
    input: open file stream
	output  the new file name
    
	read the next line from the file
	append .order to the file name
	
ProcessTheFile
    Input: the file name
    Output: ??

    Open the file:w-resize
    if the file can not be opened
         Print error message
	else
	     ProcessAFile