Looks like I downloaded a bad copy... the following has an error at the top of page 87 (there are a few other errors in the same chapter but I don't have my notes handy)

https://venkivasamsetti.github.io/ebookworm.github.io/Books/...

The pdf of the book at this link does not have the error (page 84),

https://seriouscomputerist.atariverse.com/media/pdf/book/C%2...

so hopefully it's just an issue with the pdf from the github link.