Class 12 Computer Science — Chapter 3: Stack

What you'll learn

• ▸Introduction to Data Structures
• ▸The Stack Data Structure (LIFO)
• ▸Applications of Stacks
• ▸Core Stack Operations: PUSH and POP
• ▸Stack Conditions: Overflow and Underflow
• ▸Stack Implementation using Python Lists
• ▸Helper Functions for Stack Management

Chapter Summary

--- PAGE 1 --- Chapter 3 Stack “We’re going to be able to ask our computers to monitor things for us, and when certain conditions happen, are triggered, the computers will take certain actions and inform us after the fact.” — Steve Jobs In this Chapter » Introduction » Stack » Operations on Stack » Implementation of Stack in Python » Notations for Arithmetic Expressions » Conversion From Infix To Postfix Notation » Evaluation of Postfix Expression 3.1 INTRODUCTION We have learnt about different data types in Python for handling values in Class XI. Recall that String, List, Set, Tuple, etc. are the sequence data types that can be used to represent collection of elements either of the same type or different types. Multiple data elements are grouped in a particular way for faster accessibility and efficient storage of data. That is why we have used different data types in python for storing data values. Such grouping is referred as a data structure. A data structure defin…

Practice Questions from this Chapter

Tap "Get Solution" on any question to ask our AI tutor.

1. Explain stack applications simply. Get Solution →
2. Show a real-world stack example. Get Solution →
3. Illustrate stack vs. queue differences. Get Solution →
4. According to the text, which principle does a stack data structure follow? Get Solution →
5. What is the name of the operation to add a new element to the top of the stack? Get Solution →
6. What is the name of the operation to remove the topmost element from the stack? Get Solution →
7. What potential error occurs if you try to perform a POP operation on an empty stack? Get Solution →
8. In the Python implementation provided, which built-in list method is used to implement the PUSH operation? Get Solution →

Did you know?

• 💡 A vending machine where items drop into a chute operates like a LIFO stack.
• 💡 Your computer's "undo" function remembers changes using a hidden Last-In-First-Out stack.
• 💡 In nature, lava flows often "stack" up, creating new layers on top of old ones.
• 💡 Many programming languages use a "call stack" to manage function execution in your programs.
• 💡 The English word "stack" originated from an Old Norse term meaning "a large pile."

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