Postfix Expression Evaluation using Stack | Data Structures and Algorithm | Easy Explanation

In this video, we learn how to evaluate postfix expressions using stacks—one of the most important concepts in Data Structures and Algorithms.
I’ve explained postfix evaluation step-by-step with two solved examples:

Example 1:

Evaluate the postfix expression:
10 5 + 60 6 / * 8 -

Example 2:

Evaluate the postfix expression with single-digit operands:
8 2 3 ^ / 2 3 * + 5 1 * -
(Here, ^ represents the exponent operator)

We break down the process clearly:
✔ When to push operands
✔ When to pop and evaluate operators
✔ How the stack changes after every step
✔ What the top elements of the stack are after each major operation

This video is perfect for:
💡 Students learning Data Structures
💡 Competitive programming beginners
💡 Anyone preparing for placements, GATE, UGC NET, or coding interviews

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