Write your own testing program to test the modified class -

Question

Question:

Modify our Doubly Linked List code to include following index (rank) based access operations

int RetrieveAt(int index)

void DeleteAt(int index)

void Swap(int index, int index)

index starts at 0 (just like array''s subscript)

If the index is out of bound, RetrieveAt returns -999, DeleteAt does nothing, do nothing in Swap.

Write your own testing program to test the modified class