为了更容易编写作业，我想创建两个环境Subexc和subexc，在开始之前我可以在这两个环境中写下整个练习。Subexc应该使用参数运行，指定要使用的枚举格式（请注意，我正在使用包enumerate）。Subexc然后将格式保存在变量中\subExcFormat，将练习编号保存在计数器中subExcCounter。当subexc随后运行时，它会继续练习编号和格式\Subexc。一个例子：
\usepackage{enumerate}
\newenvironment{Subexc}[1]
{%
\begin{enumerate}[#1]%
\item\ignorespaces\begin{itshape}%
}{%
\end{itshape}%
\end{enumerate}\setcounter{subExcCounter}{\theenumi}%
\global\let\subExcFormat#1%
\vspace{1 mm}\par\noindent\ignorespacesafterend%
}
\newenvironment{subexc}
{%
\begin{enumerate}[\subExcFormat]%
\setcounter{enumi}{\thesubExcCounter}%
\ignorespaces\item\begin{itshape}%
}
{%
\end{itshape}%
\end{enumerate}%
\setcounter{subExcCounter}{\theenumi}%
\vspace{1 mm}\par\noindent\ignorespacesafterend%
}
\begin{document}
\section*{Exercise 717}
\emph{In this exercise, we will prove the Riemann hypothesis.} %Text from exercise.
\begin{Subexc}{(a)} % Enumeration format of the form (a), (b), ...
Prove that $8 + 7 = 15$. % exercise text.
\end{Subexc}
Blablabla %My answer
\begin{subexc} % No format; it will continue the format from the last section.
Show that $e^{i\pi} + 1 = 0$.
\end{subexc}
Bluhbluhbluh %My answer
\begin{subexc}
Use (a) and (b) to show the Riemann hypothesis.
\end{subexc}
Wowowow %my answer
\end{document}
但是，我得到了错误
Illegal parameter number in definition of \endSubexc }
Illegal parameter number in definition of \subExcFormat \end{\subexc}
Undefined control sequence \begin{subexc}
Undefined control sequence \begin{subexc}
(Warning) The counter will not be printed.
什么地方出了错？ ：-）
答案1
您不能#1在结束部分使用。但您可以简单地将 的定义移到\subExcFormat开始部分。使用\theenumiis error:\value{enumi}正是您所需要的（顺便说一下，这是警告的原因）。
\documentclass{article}
\usepackage{enumerate}
\newcounter{subExcCounter}
\newenvironment{Subexc}[1]
{%
\gdef\subExcFormat{#1}%
\enumerate[#1]%
\item\itshape
}
{%
\endenumerate\setcounter{subExcCounter}{\value{enumi}}%
\par\vspace{1 mm}\noindent\ignorespacesafterend
}
\newenvironment{subexc}
{%
\expandafter\enumerate\expandafter[\subExcFormat]%
\setcounter{enumi}{\value{subExcCounter}}%
\item\itshape
}
{%
\endenumerate
\setcounter{subExcCounter}{\value{enumi}}%
\par\vspace{1 mm}\noindent\ignorespacesafterend
}
\begin{document}
\section*{Exercise 717}
\emph{In this exercise, we will prove the Riemann hypothesis.} %Text from exercise.
\begin{Subexc}{(a)} % Enumeration format of the form (a), (b), ...
Prove that $8 + 7 = 15$. % exercise text.
\end{Subexc}
Blablabla %My answer
\begin{subexc} % No format; it will continue the format from the last section.
Show that $e^{i\pi} + 1 = 0$.
\end{subexc}
Bluhbluhbluh %My answer
\begin{subexc}
Use (a) and (b) to show the Riemann hypothesis.
\end{subexc}
Wowowow %my answer
\end{document}
我还删除了无用的\ignorespaces命令，\begin{itshape}并且\end{itshape}。我仍然怀疑
\par\vspace{1 mm}\noindent\ignorespacesafterend
这似乎是多余的；如果您不想有新段落，请避免使用空行。请注意，\par\vspace{1mm}而不是相反。
