Text Formatting ⇒ Problem with use of \newcommand on MikTex

[Achava]

[doc]What is wrong with this code from Stgefan Kottweil's book?[/doc]

Code: Select all

documentclass {article}
\newcommand {\keyword}{1}{\textbf{#1}}
\begin {document}
\keyword{Grouping} by curly braces limits the
\keyword{scope} of \keyword{declarations}
\end {document}

[doc]Here is the error message I got:
This is pdfTeX, Version 3.14159265-2.6-1.40.21 (MiKTeX 2.9.7440 64-bit)
entering extended mode
("Page 42.tex"
LaTeX2e <2020-02-02> patch level 5
L3 programming layer <2020-05-15>
("C:\Program Files\MikTex\tex/latex/base\article.cls"
Document Class: article 2019/12/20 v1.4l Standard LaTeX document class
("C:\Program Files\MikTex\tex/latex/base\size10.clo"))

! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.2 \newcommand {\keyword}{1}{\textbf{#1}
}
? [/doc]

[Ijon Tichy]

Wrong braces for the argument number at \newcommand {\keyword}{1}{\textbf{#1}}. These must be brackets: \newcommand {\keyword}[1]{\textbf{#1}}, because it is an optional argument.

Please try to read the book more accurate. And sometimes it is a good idea to have a break.

[Achava]

Thank you. I will try, but my eyes are not so good.