Stack vs. Queue

The difference between stack and queue is that stack is a non-primitive data structure that uses first in last out method whereas queue is a liner non-primitive data structure that uses first in first out method.

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Stack vs. Queue

Data Structures is the most critical part of computer programming, there are many data structures, but the two most used data structures are stack and queue. They are thought to be the same data structure, but there is a lot of difference between a stack and a queue. If we talk about the main difference, then the main difference between a stack and a queue is that stack is a non-primitive data structure that uses first in last out method whereas queue is a liner non-primitive data structure that uses first in first out method.

Stack makes an ordered list, in this ordered list new item is added, and then existing elements are deleted. The element is deleted or removed from the top of the stack, top of the stack is known as TOS that is (top of the stack).          Not only deletion but insertion also take place from the top of the stack. Stack follow last in first out method.

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A queue is also a non-primitive data structure, but queue is different from the stack. The queue is a liner non-primitive data structure that uses first in first out method. New elements are added form the bottom of the queue. That is the reason queue follow first in first out method.

Contents: Difference between Stack and Queue

Comparison Chart

BasisStackQueue
MeaningThe stack is a non-primitive data structure that uses first in last out method.The queue is a liner non-primitive data structure that uses first in first out method.
Insertion and deletion The same end is used for insertion and deletion in the stack.Different ends are used for insertion and deletion in the stack.
Operations Stack use Push, PopQueue use enqueue, dequeue.
ComplexImplementation of the stack is not complexImplementation of the queue is complex as compared to stack.
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Stack

Stack makes an ordered list, in this ordered list new item is added, and the existing elements are deleted. Element is deleted or remove from the top of the stack, top of the stack is known as TOS that is (top of the stack).  Not only deletion but insertion also take place from the top of the stack. Stack follow last in first out method.

 Operations on stack

  • Push
  • Pop
  • Peek
  • Top
  • Is empty

Queue

A queue is also a non-primitive data structure, but queue is different from the stack. Queue is a liner non-primitive data structure that use first in first out method. New elements are added form the bottom of the queue. That is the reason queue follow first in first out method.

Key Differences

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  1. The stack is a non-primitive data structure that uses first in last out method whereas Queue is a liner non-primitive data structure that uses first in first out method.
  2. The same end is used for insertion and deletion in stack whereas different ends are used for insertion and deletion in the stack.
  3. Stack use Push, Pop whereas queue use enqueue, dequeue.
  4. Implementation of the stack is not complex whereas implementation of the queue is very complicated.

Conclusion

In this article above we see the difference and implementation of stack and queue.

Explanatory Video

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