What are the Applications of Stack in Data Structures?

A Stack is a linear data structure that follows the LIFO (Last In, First Out) principle. The element inserted last is the first one to be removed. Because of this unique property, stacks are used extensively in computer algorithms and operating systems.

Question (Click to Flip)

How is a stack different from a queue?

Answer

A stack follows LIFO (Last In First Out), like a stack of plates. A queue follows FIFO (First In First Out), like a line of people waiting at a ticket counter.

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Key Facts

The two main operations of a stack are Push (insert) and Pop (remove).

A stack is a LIFO (Last In First Out) structure.

Stack Overflow occurs when you try to push data onto a stack that is already full.

Major Applications of Stack

Undo/Redo Features: In text editors (like MS Word) or image editors, the actions you perform are pushed onto a stack. When you hit 'Undo' (Ctrl+Z), the last action is popped off the stack and reversed.
Browser History: Web browsers use a stack to keep track of visited web pages. When you click the 'Back' button, the current page is popped, and the previous page is loaded.
Expression Evaluation: Compilers use stacks to parse and evaluate mathematical expressions, converting them from Infix to Postfix or Prefix notation.
Function Calls and Recursion: The operating system uses a memory stack (the Call Stack) to manage function calls. When a function calls another function, the local variables and return addresses are pushed onto the stack.
Syntax Parsing: Checking for properly matched parentheses (), {} in programming code is done efficiently using a stack.

Questions and Answers

How is a stack different from a queue?+

A stack follows LIFO (Last In First Out), like a stack of plates. A queue follows FIFO (First In First Out), like a line of people waiting at a ticket counter.

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