😊 Happy Numbers – Learning Journey

This notebook shows my step-by-step process of understanding the Happy Numbers problem in Python.

🧩 A happy number is a number that eventually reaches 1 when repeatedly replaced by the sum of the squares of its digits.

🧠 What this notebook includes:

manual breakdown of the process (my first approach)

early experiments with strings and digit extraction

final working loop version using a while loop and a set to track visited numbers

💡 Example output:

n = 19  → 82 → 68 → 100 → 1
Your number is happy 🎉

n = 113 → ... → 4 → 16 → 37 → ... (cycle)
Your number is unhappy 😔


🚀 Concepts practiced:

working with while loops
iterating through digits
using sets to detect cycles
building logic step by step

🧭 This version is intentionally imperfect — it shows the way I think through problems, not just the final code.