LIFO Principle Explained: Stack Data Structure, Overflow & Underflow (EASY DSA)
Why do Stacks use the LIFO principle? In this 10-minute DSA tutorial, we explain the Last-In, First-Out logic using everyday examples like the "Undo" button in your browser.
We also dive into the two most common error conditions in Stack implementation: Stack Overflow and Stack Underflow. Understanding these conditions is critical for writing robust code and passing technical interviews.
What you will learn:
✅ The LIFO Principle: Why the last element is always the first to leave.
✅ Real-world applications: How the "Undo" function works.
✅ Stack Overflow: What happens when you push to a full stack?
✅ Stack Underflow: What happens when you pop from an empty stack?
✅ The top == -1 condition for empty stacks.
📍 Timestamps:
00:00 - What does LIFO (Last-In, First-Out) mean?
01:08 - Example: Pushing 10, 20, 30 and Popping
02:43 - Real-World Application: The "Undo" button logic
03:46 - Visual Demo: How Undo follows the LIFO principle
05:14 - Defining Stack Overflow & Stack Underflow
06:58 - Scenario 1: Reaching the Stack Limit (Overflow)
08:21 - Scenario 2: Trying to Pop from an Empty Stack (Underflow)
09:23 - The logic behind top = -1
10:18 - Coding Tip: How to write the Underflow check in C
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