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Data Structure
In this implementation, we have a Node class to represent a node in the linked list and a Queue class that uses this node class to implement the queue. The enqueue method adds a new node to the tail of the linked list, and the dequeue method removes the node from the head of the linked list.
Note that in the above code, head_ref is a pointer to the head node of the doubly linked list, and del_node is a pointer to the node to be deleted. The function checks if either head_ref or del_node is NULL. If either of them is NULL, it returns without doing anything.
If the node to be deleted is the head node, the head_ref is updated to point to the next node. The previous and next pointers of the adjacent nodes are updated to bypass the node to be deleted. Finally, the memory occupied by the node to be deleted is freed using the free() function.
With this implementation, we can create a circular linked list and perform operations on it as follows:
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