This is a stub of a <section>, but it contains two <subsection> which each contain a PROJECT-LIKE item that includes a <program> element, and thus is a coding exercise. This tests migration to the Runestone assignment area, though Runestone only has divisions two-deep ( “chapter” and “subchapter”, so both will show up associated with the same <section>—this one.
The first is a start of a C program, so will only be interactive on a Runestone server. The second is a Python program, so will be interactive in all HTML outputs.
You would work this project on paper, most likely. It is never interactive since there is no indication of a desire for that, even if hosted on a capable platform.
A little bit of markup, to test a bug: \(x^2\text{.}\) (The bug was only apparent under a deprecated method for specify a question to be an interactive short-answer question on Runestone Academy.)