CS604 Short Notes for Final Term

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CS604 Short Notes for Final Term
CS604 Short Notes for Final Term

You have noticed that there is no such node whose next field is NULL. What is the
benefit of this? If you use the
next or back methods that move the current pointer, it
will never point to NULL. It may be the case that you keep on circulating in the list.
To avoid this, we get help from the
head node. If we move the head node in the
circularly linked list, it will not be certain to say where it was pointing in the start.

Its  CS604 Short Notes for Final Term
advantages depend on its use. If we do not have to move too much in the list and have
no problem checking the NULL, there is little need a circularly-linked list. But this
facility is available to us.
In this example, we made a circular linked list from a singly link list. In a singly link
list we move in one direction. We point the
next pointer of the last node to the first
node. We can do the same with the doubly-linked list.

The prev pointer of the first  CS604 Short Notes for Final Term
node will point to the last node and the
next pointer of the last node will point to the
first node. If you arrange all the nodes in a circle, one of the pointers (i.e. next
pointer) will move in clockwise direction while the
prev pointers in anti-clockwise
direction. With the help of these pointers,

you can move in the clockwise direction or
anti-clockwise direction. Head node pointer will remain at its position. You don’t
need to change it. If there is a need to remove the node pointed by head node than you
have to move the head pointer to other node. Now we don’t have any NULL pointer
in the doubly-linked list. We will not get any exception due to NULL pointers.

CS604 Short Notes for Final Term

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