Happy Numbers Explained: How to Code a Java Program to Check Them!
🔢 What is a Happy Number?
In this video, we break down the concept of Happy Numbers—a fascinating mathematical idea where a number eventually reaches 1 when you repeatedly replace it with the sum of the squares of its digits. If it loops endlessly, it’s unhappy!
💻 What You’ll Learn:
✅ How to extract digits from a number using % and / in Java.
✅ Why we use a HashSet to detect cycles (and avoid infinite loops).
✅ Step-by-step tracing of the code with examples (like 19 and 2).
✅ How to implement the sumOfSquares and isHappy methods.
🚀 Challenge for You:
Can you modify the code to count how many steps it takes for a number to become happy? Comment your solution!
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