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An interesting demo

From: Doug McIlroy
Subject: An interesting demo
Date: Thu, 27 Aug 2020 20:22:20 -0400
User-agent: Heirloom mailx 12.5 7/5/10

For a demonstration of the power of m4 stripped to the
bare minimum--no builtins other than `define'--see
www.cs.dartmouth.edu/~doug/barem4.txt. (Because browsers
may not like .m4 files, it's called .txt--but is not
Windows format.) Well-commented code builds quickly from
nothing to binary arithmetic. Final remarks outline how
to simulate a computer and its memory--all within m4.

To try it, you might begin by entering one of the many
examples given in the program's comments:

prompt> m4 barem4.txt -

I hope you enjoy it. Comments and criticism will be
gratefully received.


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