Stack
Karnataka Board · Class 12 · Computer Science
Quick revision notes for Stack — Karnataka Board Class 12 Computer Science. Key concepts, formulas, and definitions for last-minute revision.
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See them allKey Topics to Revise
Introduction to Stack
- Stack is a linear data structure with LIFO (Last-In-First-Out) principle
- Elements are added and removed from the same end called 'TOP'
- Real-life examples: pile of plates, stack of books, bangles on wrist
Stack Operations
- PUSH operation: Adds element to the top of stack
- POP operation: Removes and returns top element from stack
- isEmpty(): Checks if stack is empty
Implementation of Stack in Python
- Python lists can be used to implement stacks efficiently
- append() method adds elements to the right end (top of stack)
- pop() method removes elements from the right end (top of stack)
Expression Notations
- Infix notation: operators between operands (x + y)
- Prefix notation: operators before operands (+xy)
- Postfix notation: operators after operands (xy+)
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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