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# bachotex2007-jerzy-ludwichowski-pearl1.tex

bachotex2007-jerzy-ludwichowski-pearl1.tex — TeX document, 1 KB

## Zawartość pliku

%%% Double-circumflex trap

% Is there a difference between those two cases?

\number\^^A
\number^^A

\number\^^@
\number^^@

In the case of '^^A' (character code 1), both lines yield the number 1, the
backslash character's presence before the double-circumflex doesn't influence
the result. In the second case, the first line yields 0, while the second
results in 32. The reason is that the character of the code 0 ('^^@') has the
associated category code ignored' (9). Any character of the category 9 will
simply be omitted, except when there is a backslash immediately before it. If
there is no backslash, the very next character is considered, which is a code
32... Well, actually its end-line character, which is replaced by the
character of the code being a current value of \endlinechar, which is 13 by
default, and character 13 has a default category code 5, which is finally
converted to the character 32.

\end
`

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