用户定义环境中的堆叠环境

Question

我正在使用两个包 - 练习和列表。我正在尝试为包含源代码的答案创建一个环境“codeAnswer”，这样我就不必这样做了 -

\begin{Answer}
\begin{lstlisting}
<code answer>
\end{lstlisting}
\end{Answer}

但它不起作用。一如既往，任何帮助都值得感激 :) 下面是有缺陷的代码：

\documentclass[11pt]{article}
\usepackage[answerdelayed]{exercise}
\usepackage{listings}

%need to fix
\newenvironment{codeAnswer}
{
    \begin{Answer}
    \begin{lstlisting}
}
{
    \end{lstlisting}
    \end{Answer}
}

\begin{document}

\begin{Exercise} 
What is 2 + 3?  
\end{Exercise}
\begin{Answer}
5   
\end{Answer}

\begin{Exercise}
Write a piece of code that divides 5 by 2 and stores in an integer $x$. 
\end{Exercise}


%Following commented part works fine
%\begin{Answer}
%\begin{lstlisting}
%int x = 5/2;   
%\end{lstlisting}   
%\end{Answer}

%FOLLOWING DOESN'T WORK
\begin{codeAnswer} 
int x = 5/2;    
\end{codeAnswer}

\shipoutAnswer
\end{document}

Answer 1

使用\lstnewenvironment，但使用\Answer和\endAnswer：

\documentclass[11pt]{article}
\usepackage[answerdelayed]{exercise}
\usepackage{listings}

\lstnewenvironment{codeAnswer}[1][]
  {\Answer\lstset{#1}}
  {\endAnswer}

\begin{document}

\begin{Exercise}
What is 2 + 3?
\end{Exercise}
\begin{Answer}
5
\end{Answer}

\begin{Exercise}
Write a piece of code that divides 5 by 2 and stores in an integer $x$.
\end{Exercise}

\begin{codeAnswer}
int x = 5/2;
\end{codeAnswer}

\shipoutAnswer
\end{document}

您还可以使用它

\begin{codeAnswer}[<options for lstlisting>]