Problem Set 2

What to Do

  1. Log into using your GitHub account
  2. Run update50 in your codespace’s terminal window to ensure your codespace is up-to-date and, when prompted, click Rebuild now
  3. Submit Readability
  4. Submit one of:

If you submit more than one of Bulbs, Caesar, Substitution, or Wordle50, we’ll record the single highest of your scores among those problems.

When to Do It

By the College Board’s AP deadlines for the 2023–2024 academic year.


  • Try out any of David’s programs from class via Week 2’s examples.
  • To see the manual pages for C functions, visit
  • If you see any errors when compiling your code with make, focus first on fixing the very first error you see, scrolling up as needed. If unsure what it means, try asking help50 for help. For instance, if trying to compile readability, and
    make readability

    is yielding errors, try running

    help50 make readability