[throwaway_pdp09]

> I write plenty of DSP, GPGPU programming, and computer vision ... I can't honestly remember the last time I wrote a recursive function.

Not remotely surprising is it. Hopefully if you went for a suitable job they wouldn't ask unsuitable questions. Then again, writing a recursive factorial should pain no-one.

[dhosek]

Exactly. I wasn't asking people to do something difficult. I don't think that there's a simpler recursive function than this, if you can't do this, then you don't have basic knowledge of what a recursive function is. I learned how to do this in high school.