Difference between stack and queue?

Stack: Like a stack of plates, you can only remove the top plate and place a new one on the very top.
Queue: Like a line of people waiting for tickets, the first person to line up is served first, and newcomers must wait at the end of the line.
For example, the Palworld 1.0 Breeding Calculator that I developed utilizes various stacks and queues to process queries.

Free game1mo

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 sahu2mo

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 sahu2mo

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 Prajapati8mo

Key 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.

Pankajkumar Patel11mo

STACK A stack is a linear data structure that follows the LIFO (Last In, First Out) principle. This means the element inserted last will be removed first. Key Features: Elements are added and removed from the same end (called TOP). Works like a stack of plates — the last plate kept is the first to be taken out. Operations: Push: Insert an element into the stack. Pop: Remove the top element from the stack. Peek/Top: View the top element without removing it. Example: Imagine a pile of books 📚. You keep placing books on top (push). To take one, you remove the topmost book first (pop). Applications of Stack: Undo/Redo functionality in editors Browser history (back and forward buttons) Expression evaluation in programming Recursive function calls QUEUE Definition: A queue is a linear data structure that follows the FIFO (First In, First Out) principle. This means the element inserted first will be removed first. Key Features: Elements are added at the rear (enqueue) and removed from the front (dequeue). Works like a bus queue — the first person in line gets in the bus first. Operations: Enqueue: Insert an element at the rear. Dequeue: Remove an element from the front. Peek/Front: View the front element without removing it. Example: A ticket counter The person who comes first gets the ticket first.

Gaurav Kumar1y

Difference between stack and queue?

6 Answers