One can dequeue an element from one end and enqueue element from another end. There is only one end to carry both push and pop operation. In Dequeue operation you don’t need to do anything with the REAR pointer. Increment the FRONT pointer to point it to next front object.(Store in a local variable to use in the application.) Get access to the object pointed by the FRONT pointer.The operation of removing an element from the queue is called as Dequeue operation. In Enqueue operation you don’t need to do anything with the FRONT pointer. The operation of adding an element in the queue is callaed as Enqueue operation. Here ‘Back’ pointer is the same as ‘Rear’ pointer. Unlike stack data structure, queue requires two pointers so-called FRONT and REAR. What are the operations are involved in the Queue? Point the ‘top’ pointer to the next object in the stack.Įven it is possible to implement stack operation using an array.(Save the object in a local variable to use in the application.) Access the topmost object using the top pointer.The operation of removing top elements from the stack is PUSH operation. Increment the pointer and point it to the newly added object.Find the pointer pointing to the top element of the stack.The operation of adding an element to the stack is PUSH operation. Stack uses ‘top’ pointer which is always pointed to the most recently added element in the stack. What are the operations are involved in Stack? Difference Between Stack and Queue by Their Operations So understanding the difference between the operations of stack and queue is crucial. If you are preparing for GATE or any other competitive CS exam, you may be asked to find the valid sequence for the elements stored in stack or queue. Understanding Stack and Queue for Career point of view: The person enters a restaurant first gets service first.Įxample: Queue is used in BFS (Breadth First Search) algorithm. In the programming, the queue is useful to store the data elements when you want to treat or process element which is added first. Use the stack for storing data elements, when you need recently added object to be treated/processed first.Įxample: In the searching algorithm, one of the primary application of the stack is DFS (Depth-First Search). Learning these data structures does not make any sense if you don’t know where to use them. Applications | When to Use Stack vs Queue? The order of removal of data object defines the use of these two data structures. If you compare the stack and queue, you can see the difference is in order of removing element/object. It means an object which is added first only can be removed. Unlike stack, the queue follows FIFO (First In First Out) mechanism. But the user can only remove the data which is added first. The queue is a data structure where the user can add data object at any time. It means the object which is added last only can be removed. The stack follows LIFO (Last In First Out) mechanism. But, the user can only remove the data which is added at last. The stack is a data structure where the user can add a data object any time. But, they are not mean to be similar in any way. This is the only similarity between stack and queue. Let’s start with the definition of Stack and Queue.įor the sake of simplicity, we can define stack and queue as the collections of the objects, just like an array in the data structure. How Array is different from Stack and Queue?.Comparison Stack vs Queue in Tabular Form.
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