Op solved it, closing

cool!

notice that the declaration shows int *extraPerfect? that * means you need to return a pointer to a dynamically allocated int array containing the extra perfect numbers. if it had just been int extraPerfect you would only have been returning an int value. finally: you also need to set the provided pointer *count to the length of the array for which you are returning a pointer. hope that helps.

Float parameter "bounce" must be greater than 0 and less than 1

You have an infinite loop in your code when bounce is 1.

good (I'm the translator) I was just checking your code. congrats!

It means exactly the opposite. Expected and actual values aren't equal, that's why you're getting this message. Maybe try to printf(...) the input, and your output to make sure they're correct?