[tex-k] Suggestions about exercises 22.10 and 21.10 in TeXbook

Igor Liferenko igor.liferenko at gmail.com
Fri Nov 15 08:48:47 CET 2019

Hi, all


According to definition of preamble on p.235,
\cr is part of preamble. So, in exercise
22.10 the text


should be changed to


This agrees with the answer, where \cr is used.

In current state, after substituting the answer,
the code will contain \cr\cr.


This is the answer to exercise 21.10:

    {\let\the=0\edef\next{\write\cont{<token list>}}\next} will
    expand everything but \the when the \write command is given.

Although I understand the idea, the wording seems not apt.
I understand this something as this:

    \write will be executed after \edef expands everything
    except \the.

But maybe I misunderstand something.


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