Should have started with Hello world first. Introducing newbies to variables to do a Fibonacci sequence is very hard for them.
Nice use of the vMac emulator.
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Don't you think it's a bit odd that the example program uses short-circuiting booleans as conditionals and uses the fabled downto operator?[1] The article's not teaching how to program, it's just showing you how to set up THINK C -- the intro suggests that the target audience is programmers ("I can see [...] that you, too, are a programmer.")
[1] https://stackoverflow.com/questions/1642028/what-is-the-oper...
If one’s going to argue about choice of first programs, a proper Hello World on classic macOS requires the use of the Mac Toolbox. Using the bundled Think C console isn’t really producing a Mac-native program.
Where's a good place to find a guide to that?
The definitive reference is Apple's own Inside Macintosh. Many parts of that are still available on the Apple developer web site, e.g.
https://developer.apple.com/library/archive/documentation/ma...
https://developer.apple.com/library/archive/documentation/ma...
For a more directed and more C-oriented walkthrough, the Macintosh C Programming Primer was a pretty common go-to. It's been out of print for ages, of course, but there's a PDF available at:
https://vintageapple.org/macprogramming/pdf/Macintosh_C_Prog...
You can search for "Toolbox" and "Tool Box" here:
Vintage Macintosh Programming Book Library - https://vintageapple.org/macprogramming/