In today’s DSA Tutorial, I implemented Recursion with two classic problems:
Factorial
Sum of Natural Numbers (1 to N)
These two programs are the foundation of recursion understanding — and in this video, I explained them with clear logic, base case breakdown, recursive calls, and call stack diagrams.
You will learn:
How factorial works recursively
* What is the base case?
* How recursive calls build the answer
* How call stack expands & collapses
* Complete dry-run with diagrams
Sum of Natural Numbers using Recursion
* How to break a big problem into smaller ones
* Why recursion is perfect for mathematical patterns
* Clear tracing of each step
Base Case & Recursive Case Importance
* What happens if base case is missing?
* How infinite recursion leads to stack overflow
Call Stack Visualization
I explained EXACTLY how function calls are pushed & popped from stack during the recursion process — making everything super simple to understand.
This tutorial is PERFECT for:
Students learning recursion for the first time
University lab tasks + assignments
Coding interview basics
Java beginners
Anyone who gets confused by recursion
By the end of this video, Recursion will feel easy and logical — not scary anymore!
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Source Code:
https://github.com/farzeen-ali/DSA-Concepts-The-Techzeen-2025
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https://github.com/farzeen-ali/DSA-Lectures-2025-The-Techzeen
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