There are already fixed tests with negative numbers, your solution will also return false (which is correct) for n = -5 / n = -6 because when x = 2, -6 != 2 * 3 for both cases above.

no random tests in Clojure and Ruby

I was not able to replicate the problem, the reference solution returns false for 72 and other non-powers multiples of 4 such as 20, 44, etc. Nevertheless, I added those as fixed tests and upgraded the C# random tests to improve coverage. This kata still has a poor design in C# due to the parameter being an object and the input validation, which is already not a good idea, is underspecified and not toroughly tested.

Thanks!

duplicate of this issue

duplicate of this issue

4.00000000000000002 == 4.0 though, so it should return true

added a few multiples of 4 to Clojure tests

In Clojure, the test cases do not check any multiples of 4 that are not powers. Please add 12 false to the test cases.

OP solved it, closing

You should check for other input types too.

If parameter is not an Integer (eg String, Array) method should return false as well.

Also, your code will fail for 16 (Power of 4) because Math.sqrt(Math.sqrt(16)) --> Math.sqrt(4) --> 2, but 2 is not divisible by 4.

It's probaby because you can get the same number as int, long, string or whatnot. Check it with Console.WriteLine(n.GetType()) to know for sure.

Isn't eval a dangerous method? You can easily execute any line of code using it, including malicious

C# issue in random tests Still exists, I get the number which did'nt passed in "attempt" random test, then I put it in "test" Basic test it passed.

You can print inputs to console and they will appear in test output.

Example in Python: https://docs.codewars.com/training/troubleshooting/#print-input