Stack: Introduction, Representation, Operations, Applications of Stack

1. Queue and Stack
By SIVAKUMAR R

2. Queue - Introduction
• Follows FIFO (First In First Out).
• Insert at rear (Enqueue), remove from front (Dequeue).
Explanation: Think of a line at a ticket counter; first person to enter is first to leave.
Queue Representation

3. Queue - Representation
• Array representation.
• Linked list implementation.
Explanation: Arrays are simple but have fixed size; Linked lists are dynamic.

4. Queue - Operations
• Enqueue, Dequeue, Peek, isEmpty, isFull.
Explanation: Operations help manage elements efficiently.

5. Types of Queue
• Simple Queue
• Circular Queue
• Priority Queue
• Deque
Explanation: Different types provide flexibility for various use cases.

6. Applications of Queue
• CPU scheduling
• Disk scheduling
• Data buffering
• Request handling
Explanation: Queues are used wherever order of processing matters.

7. Stack - Introduction
• Follows LIFO (Last In First Out).
• Insert and remove from the same end (Top).
Explanation: Think of a stack of plates; last placed is first removed.
Element 3
Element 2
Element 1

8. Stack - Representation
• Array representation.
• Linked list implementation.
Explanation: Similar to queues, arrays are fixed while linked lists are flexible.

9. Stack - Operations
• Push, Pop, Peek, isEmpty, isFull.
Explanation: Stack operations ensure controlled access to elements.

10. Applications of Stack
• Function calls
• Expression evaluation
• Parsing
• Undo/Redo
• Backtracking
Explanation: Stacks are vital in programming and problem solving.