# can't type [replace] [duplicate]

I need to type some code in Latex, but when I type [replace] (as a part of the code) it says:

"Missing number, treated as zero"

Here is my minimal working example:

       \documentclass[]{report}
\begin{document}
\texttt{
[some text]\\
some other text\\
[replace]\\
blablabla\\
}
\end{document}


Any Help is appreciated :) Thanks a lot in advance!

## marked as duplicate by ArTourter, Werner, Claudio Fiandrino, T. Verron, user2478 Jun 27 '13 at 14:33

• It's because of the square parenthesis after the double backslash. Try this: \documentclass{report} \begin{document} \texttt{ [some text]\ some other text\\~ [replace]\ blablabla\ } \end{document} – bersanri Jun 27 '13 at 13:26

The problem is that [...] after \\ is read as an optional argument. It can be used to specify more vertical space between the lines via e.g. \\[12pt]. But here you do not want your text [...] read as an argument to the \\ command, instead you need to tell LaTeX to take it easy with \\\relax:

\documentclass{report}

\begin{document}

\texttt{
[some text]\\
some other text\\\relax
[replace]\\
blablabla\\
}

\end{document}


In genaral you should not be using \\ to break lines on ordinary text. A blank line will give a new paragraph. \\ is appropriate in environments such as center or flushleft. For code examples the verbatim environment would be a better start:

\begin{verbatim}
[some text]
some other text
[replace]
blablabla
\end{verbatim}


Here the line breaks in your source are respected and you don't need \\. More sophisticated code typesetting is provided by packages such as listings.