Answers

What is the difference between stack and queue?

Pankajkumar Patel

1y1.1k.NET

Main difference between Stack and Queue is how elements are added and removed.

Stack

Order: Last In, First Out (LIFO)
Operations:
1. Push: Add an element to the top
2. Pop: Remove the top element
Use Case: Undo functionality in software, where the last action is undone first.
Example:
1. Stack (Top → Bottom):
2. [5]
3. [3]
4. [1] ← First inserted
5. Pop removes 5, the last inserted.

Queue

Order: First In, First Out (FIFO)
Operations:
1. Enqueue: Add an element to the end
2. Dequeue: Remove the front element
Use Case: Print queue, where the first document sent is printed first.
Example:
1. Queue (Front → Rear):
2. [1] ← First inserted
3. [3]
4. [5]
5. Dequeue removes 1, the first inserted.

7 Answers

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Jenny Arora6d

A stack and a queue differ in how they process data. A stack follows the Last In, First Out (LIFO) principle, meaning the most recently added item is removed first. A queue follows the First In, First Out (FIFO) principle, papa louie, where the first item added is the first one removed.

michaelLarry2mo

A Stack follows LIFO (Last In First Out), where the last inserted element is removed first. A Queue follows FIFO (First In First Out), where the first inserted element is removed first. Stack operations are Push and Pop, while Queue operations are Enqueue and Dequeue.

Sujeet Kumar sahu3mo

Stack : Stack is works on Last in First out (LIFO) principle . Means elements are add and remove only one way .

Queue : Queue is works on First out First out (FIFO) principle . Which means elements are add first into queue is also remove first .

Priya Prajapati7mo

The main difference between a stack and a queue is the order of data operations— how elements are added and removed. In a stack, data is added last and removed first (Last In, First Out – LIFO), whereas in a queue, data is added first and removed first (First In, First Out – FIFO). Example of Stack: Function evaluation Examples of Queue:Task scheduling, message queues and many more

Prarthana Bhat10mo

Stack vs Queue
Feature Stack Queue
Definition A linear data structure that follows LIFO (Last In, First Out). A linear data structure that follows FIFO (First In, First Out).
Insertion/Deletion Happens at the same end (top). Happens at different ends — insert at rear, remove from front.
Example Stack of plates — last plate kept is removed first. Queue of people — first person in line is served first.
Main Operations push(), pop(), peek() enqueue(), dequeue(), front()

Anand Pandey10mo

Stack => Last in - First Out
you can see it in Ctrl+Z

Queue => First in - First Out
you can see it in Sending Message

Sepehr Shn11mo