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\begin{tabular}{@{}l*{2}{>{\textbackslash\ttfamily}l}l

tag-icon • tag-icon tables booktabs
\begin{tabular}{@{}l*{2}{>{\textbackslash\ttfamily}l}l 
\documentclass{article}
\usepackage{booktabs}
\newcommand{\head}[1]{\textnormal{\textbf{#1}}}
\newcommand{\normal}[1]{\multicolumn{1}{l}{#1}}
\begin{document}
\begin{tabular}{@{}l*{2}{>{\textbackslash\ttfamily}l}l<{Example text}@{}}
  \toprule[1.5pt]
  & \multicolumn{2}{c}{\head{Input}} & \multicolumn{1}{c}{\head{Output}}\\
  & \normal{\head{Command}} & \normal{\head{Declaration}} & \normal{} \\
  \cmidrule(lr){2-3}\cmidrule(l){4-4}
  Family & textrm & rmfamily & \rmfamily\\
  & textsf & sffamily & \sffamily\\
  & texttt & ttfamily & \ttfamily\\
  \bottomrule[1.5pt]
\end{tabular}
\end{document}

上述代码片段会产生一个错误

\begin{tabular}{@{}l*{2}{>{\textbackslash\ttfamily}l}l<{Example text}@{}}

而且，我不明白错误原因。错误信息为“错误：LaTeX 错误：数组参数中的字符非法”。这是什么问题？

答案1

在列条目的开头或结尾插入内容由>{<start>}或执行<{<end>}。此功能由array包裹，但您没有包括：

在此处输入图片描述

\documentclass{article}
\usepackage{booktabs}
\usepackage{array}
\newcommand{\head}[1]{\textnormal{\textbf{#1}}}
\newcommand{\normal}[1]{\multicolumn{1}{l}{#1}}
\begin{document}
\begin{tabular}{@{}l*{2}{>{\textbackslash\ttfamily}l}l<{Example text}@{}}
  \toprule[1.5pt]
  & \multicolumn{2}{c}{\head{Input}} & \multicolumn{1}{c}{\head{Output}}\\
  & \normal{\head{Command}} & \normal{\head{Declaration}} & \normal{} \\
  \cmidrule(lr){2-3}\cmidrule(l){4-4}
  Family & textrm & rmfamily & \rmfamily\\
  & textsf & sffamily & \sffamily\\
  & texttt & ttfamily & \ttfamily\\
  \bottomrule[1.5pt]
\end{tabular}
\end{document}

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