Practice with Recursive Functions Recursion is a very useful programming skill. You may not use it very often in most languages, but the ability to think recursively is a valuable skill to acquire.

The bug arises from calling the recursive function with negative numbers and missing a condition to handle this edge case in a recursive function. This leads to an infinite chain of recursive calls ...

Recursion can also be indirect. One function can call a second, which calls the first, which calls the second, and so on. This can occur with any number of functions ...