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\string command behavior - Plain TeX

fontsplainAdd tags LaTeX specific issues not fitting into one of the other forums of this category.

\string command behavior - Plain TeX

Hi, I would like to learn Plain TeX and I'm reading Knuth's "The TeXBook".At Chapter 7, Knuth talks about the \string command and how it converts control sequences into lists of characters tokens. Why when I typed \string\TeX I got "TeX, but when I wrote {\tt \string\TeX} I got \TeX?

I guess it's something related to \escapechar, because when I changed this control sequence the output changed too:
Code: Select all  •  Open in writeLaTeX
\escapechar=^\string\TeX

generates
^TeX

Posts: 3
Joined: Mon Jun 4th, 2012

Re: \string command behavior - Plain TeX

Run this code (or click Open in writeLaTeX), and you can see that the backslash \ from the typewriter font is replaced by " in the font table of the roman font - at place '134 (92):

Code: Select all  •  Open in writeLaTeX
\documentclass{article}\usepackage{fonttable}\begin{document}\fonttable{cmr8}\fonttable{cmtt8}\end{document}`

cmr.png (21.84 KiB) Viewed 967 times

cmtt.png (16.63 KiB) Viewed 967 times

You may notice further differences regarding special symbols. In typewriter font, most used special symbols are different to those required in standard text.

Stefan

Stefan_K

Posts: 6377
Joined: Mon Mar 10th, 2008
Location: Hamburg, Germany

Re: \string command behavior - Plain TeX

Regards
Clemens
------------------------------
New German Q&A site about TeX: http://texwelt.de/wissen
System: TeXlive 2013, OpenSUSE 12.3

cgnieder
Site Moderator

Posts: 1687
Joined: Sat Apr 16th, 2011
Location: Germany

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