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Added HappyNumber algorithm in maths section #6571

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ruturajjadhav07 wants to merge 5 commits into TheAlgorithms:master
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@ruturajjadhav07 ruturajjadhav07 commented Oct 1, 2025 •
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Description

This PR adds an implementation of the Happy Number algorithm in HappyNumber.java along with corresponding unit tests in HappyNumberTest.java.

  • Implements cycle detection (Floyd’s Tortoise & Hare method) for efficiency.
  • Includes detailed Javadoc and examples.
  • Unit tests cover known happy numbers, unhappy numbers, and large input cases.
  • I have read CONTRIBUTING.md.
  • This pull request is all my own work -- I have not plagiarized it.
  • All filenames are in PascalCase.
  • All functions and variable names follow Java naming conventions.
  • All new algorithms have a URL in their comments that points to Wikipedia: Happy Number
  • All new code is formatted with clang-format -i --style=file path/to/your/file.java

Notes

  • Added both the algorithm and its unit tests.
  • Used Wikipedia reference for algorithm definition.

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codecov-commenter commented Oct 1, 2025 •
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.51%. Comparing base (d8ddb07) to head (59b233f).

Additional details and impacted files 
@@ Coverage Diff @@
## master #6571 +/- ##
============================================
+ Coverage 75.50% 75.51% +0.01% 
- Complexity 5688 5693 +5 
============================================
 Files 694 695 +1 
 Lines 19570 19583 +13 
 Branches 3791 3794 +3 
============================================
+ Hits 14776 14789 +13 
 Misses 4217 4217 
 Partials 577 577

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Hi
I hope you're doing well! I wanted to follow up on my pull request where I added the HappyNumber algorithm to the maths section of the project. I noticed there hasn’t been any feedback yet, and I just wanted to check if there are any questions or if something is unclear about the changes I made.

Please let me know if you need any further details or adjustments. I’d appreciate any feedback when you get the chance.

Thanks in advance for your time!

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@DenizAltunkapan DenizAltunkapan Awaiting requested review from DenizAltunkapan DenizAltunkapan is a code owner

@yanglbme yanglbme Awaiting requested review from yanglbme yanglbme is a code owner

@alxkm alxkm Awaiting requested review from alxkm alxkm is a code owner

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