Guys passed the C kata as it was, not tricky:-)
Nevertheless I removed the comma. Please tell me if it fits you now.
Cheers!

Didn't you have a "#include /cmath/" ('/' instead of '<' because it doesn't show up) in your code?
Otherwise uncomment it in the "Example tests" if it is still commented.
Edit: I just uncommented it.

Congrats to 14k! :-)

There is nothing a word about, that the sizes starts from 1. This was only in your head. :-)

All public examples start at 1, though.

There is nothing a word about, that the sizes starts from 1. This was only in your head. :-)

And it is only one size missing. You can just return one value, so why there should be more missing sizes?

It is normal on codewars that you cannot see all suite tests.

Great, that you solved it! :-)

Where do you think is a problem with the description?