识别上一个问题编号

Question

使用考试类别，我想识别前一个问题编号。

例如当您有 3 个问题时。

第一季度 第二季度 第三季度

我想在 Q1 和 Q2 之间插入一段代码，该代码的结果将显示the previous question is 1。

同样，在 Q2 和 Q3 之间代码将显示the previous question is 2。

如果您尝试将代码放在最后一个问题之后，代码将会显示end of question。

我有我的 MWE：

\documentclass[10pt,addpoints]{exam}
\begin{document}
\begin{questions}
    
\question[1] This is Q1.\\
\textbf{The previous question was 1.} % This is what to figure out.


\question This is Q2
\begin{parts}
    \part[1] Q2 Part a
\end{parts}
\textbf{The previous question was 2.}
\question[1] This is Q3.\\
\textbf{The previous question was 3.}
\question This is Q4
\begin{parts}
    \part
    \begin{subparts}
        \subpart[1]
    \end{subparts}
\end{parts}
\textbf{The previous question was 4.}
\question[1] This is Q5.\\
\textbf{The previous question was 5.}
\end{questions}
\end{document}

我已用粗体突出显示我想要的结果。

Answer 1

\documentclass[10pt,addpoints]{exam}

\newcommand{\lastquestion}{%
    % The class exam writes the definition of \exam@numquestions
    % in the .aux file. In the first LaTeX run, \numquestions sees
    % that \exam@numquestions is missing and expands to \mbox{...??}
    % that breaks \ifnum.
    \ifcsname exam@numquestions\endcsname
        \ifnum\value{question}<\numquestions\relax
            \thequestion
        \else
            end of question%
        \fi
    \else
        \thequestion
    \fi}

\begin{document}
\begin{questions}
    
\question[1] This is Q1.\\
\textbf{The previous question was \lastquestion.}

\question This is Q2
\begin{parts}
    \part[1] Q2 Part a
\end{parts}
\textbf{The previous question was \lastquestion.}
\question[1] This is Q3.\\
\textbf{The previous question was \lastquestion.}
\question This is Q4
\begin{parts}
    \part
    \begin{subparts}
        \subpart[1]
    \end{subparts}
\end{parts}
\textbf{The previous question was \lastquestion.}
\question[1] This is Q5.\\
\textbf{The previous question was \lastquestion.}
\end{questions}
\end{document}