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From: Doug McIlroy <doug@cs.dartmouth.edu>
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Date: Mon, 30 Dec 2019 23:24:02 -0500
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Subject: Re: [TUHS] pic anomalies
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The use of %% to designate a literal % in printf is not
a recent convention. It was defined in K&R, first edition.

Doug

Ralph Cordery wrote:

Though that may seem odd to our modern C-standardised eyes, it's
understandable in that if it isn't a valid %f, etc., format specifier
then it's a literal percent sign.