For a linked queue without head node,what should we do in dequeue operation.

In a linked queue without head node, dequeue operation involves removing the first element of the queue and updating the front pointer to point to the new first element. The steps involved in dequeue operation are:

1. Check if the queue is empty, i.e., if front is NULL.
2. If the queue is not empty, store the value of the front node in a temporary variable.
3. Update the front pointer to point to the next node in the queue.
4. Free the memory occupied by the temporary variable.
5. If the queue becomes empty after dequeue operation, also update the rear pointer to NULL.

Here is an example code snippet in C to implement dequeue operation for a linked queue without head node:

int dequeue(Queue *q) {
    if (q->front == NULL) {
        printf("Queue is empty\n");
        return INT_MIN;
    }
    int value = q->front->data;
    Node *temp = q->front;
    q->front = q->front->next;
    free(temp);
    if (q->front == NULL) {
        q->rear = NULL;
    }
    return value;
}

Note that this code assumes that the queue has been initialized properly and the necessary structures have been defined.