C++ Challenges: The Plan, and Why They're Not Live Yet
The nearest of the three languages still to come, and the interpreter picked out to run it.
Learn to Write Code's lesson chain runs seven languages deep -- Concept, Pseudocode, Python, JavaScript, C#, Java, C++. Coders Rock ships the front half today. C++ is the closest of the remaining three: the plan is JSCPP, a pure-JavaScript C++ interpreter built specifically for teaching, free and light, covering the cout/if/loop level these lessons actually need.
It isn't live yet because it hasn't been verified against this site's own lesson samples the way the Python interpreter already has been -- the JSCPP project has been quiet since around 2018, and a community fork continues it, so checking it actually handles what these challenges need comes before committing to it, not after. Until it ships, C++ challenges don't exist here rather than existing with a Run button that doesn't work.
Everything above runs in this page, on your own machine. There is more of it on the practice pages.