- 
      
Starting with the orderedList source code from Lab Assignment AB29.2, OrderedList, modify the class definitions to implement a doubly-linked list.
     
  - 
        
The requirements for this lab:
        
          - 
            
Read a data file (file10.txt) from disk and build an ordered doubly-linked list.
           
          - 
            
Print the list in the forward direction. Include a line number for each pair of id/inv values.
           
          - 
            
Print the list in the backward direction. Include a line number for each pair of id/inv values.
           
          - 
            
Delete values specified by your instructor. Be aware that your algorithm must deal with attempts to delete values that are not in the list.
           
          - 
            
Print the list again in the forward direction only.
           
        
   
  - 
    
You might want to test your delete algorithm on a shorter file, such as (file3.txt).