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在单独的页面上打印考试类别的答案

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在单独的页面上打印考试类别的答案

我在这个网站上看到过一些问题，要求解决此问题；我自己也遇到过这种情况。我的代码只能将答案打印为与问题编号相同的列表；它不会将它们放在任何特定格式上，也不会制作评分表。我修改了来自这个答案。

答案1

要点提到的答案是将所有答案收集到一个垂直框中，然后在后期转储它们，同时使用环境answer来执行此操作（在我看来，这是一个相当优雅的解决方案）。我的补充是：

  1. 打印正确答案所获得的分数。
  2. 自动在每个答案上打印问题编号。
  3. 打印多项选择题的正确答案。
  4. 自动将答案转储到有标题的新页面上。

下面是我对其中每个部分工作原理的理解以及注释的代码（如果有任何错误，请纠正）：

\documentclass[addpoints]{exam}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%CODE TO PRINT ANSWERS ON A SEPARATE PAGE %%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\def\answers{Answer key}%DEFINE THE NAME OF THE ANSWER PAGE.
%%%%% SET THE BOX WHERE THE ANSWERS WILL BE STORED
\newbox\allanswers
\setbox\allanswers=\vbox{}
%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%ENVIRONMENT FOR ANSWERS
\newenvironment{answer}
{%
    \global\setbox\allanswers=\vbox\bgroup%BEGINS A VERTICAL BOX (1)
    \unvbox \allanswers\par%%%RECURSIVELY ADD NEW ANSWERS TO THE \vbox.
    \hspace{2em}\makebox[1pt][r]{\thequestion.\ }%%%%%%THIS PRINTS THE CURRENT QUESTION NUMBER AFTER ALL THE PREVIOUS QUESTOINS HAVE BEEN ADDED TO THE BOX; THE FIRST \mbox IS RIGHT-ALIGNED, SO IT PRINTS THE NUMBER ON THE CORRECT COLUMN. IF ABSENT, THE 1 OF A 13 WILL BE ON THE SAME COLUMN AS A 9.
    \mbox\bgroup%PUTS EVERYTHING INSIDE AN UNBREAKABLE BOX, FOR QUESTIONS ARRANGED ON COLUMNS, BECAUSE THE ANSWERS WILL BE THEN PRINTED THE SAME WAY; \bgroup BEGINS SUCH A BOX...(*)
}%
{%
    (\pointsofquestion{\value{question}} \points)%PRINTS THE POINTS OBTAINED, IN PARENTHESES; USEFUL WHEN GRADING WITH ONLY THE ANSWER KEY AT HAND.
    \egroup%(*)...\egroup ENDS IT.
    \medbreak%A BIT MORE OF SPACE BETWEEN ANSWER, SO YOU CAN USE \displaystyle IF NEEDED.
    \egroup%ENDS THE VERTICAL BOX (1)
}
%%%%%%%%% /ANSWERS

%%%%%%%%%%%%PRINT ALL ANSWERS ON A SEPARATE PAGE
\newcommand{\showallanswers}{%
    \par\pagebreak%NEW PAGE FOR OUR ANSWERS
    \pagestyle{empty}%
    \makebox[\linewidth][c]{\hfill{\Large\bfseries\answers}\hfill}\par%CENTRED BOLDFACE TITLE FOR THE ANSWER KEY.
    \null\par%EXTRA SPACE FOR THE TITLE, OTHERWISE IT LOOKS VERY CRAMMED.
    \unvbox\allanswers}
%%%%%%%%%%%%%%%%%%%%%%/PRINTANSWERS%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%% TO-DO:
%1. Let the answer environment decide whether to print points; not print them if the question has no points.
%2. Use only the command \CorrectChoice to print the correct answer in a multiple-choice question, without the '\setcounter{correct}{\value{choice}}' line.
%DO ALL OF THE ABOVE REDEFINING THE solution ENVIRONMENT ALREADY DEFINED BY THE exam CLASS.
%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}

\begin{questions}
\pagestyle{empty}
\newcounter{correct} %COUNTER TO STORE THE VALUE OF A CORRECT CHOICE.
    \question[1] Did John Doe sign the Magna Carta?

    \begin{answer}
        He was busy baking bread, so he couldn't make it.
    \end{answer}

    \question[3] Who's Hamlet's true friend?
    \begin{answer}
        None, according to himself.
    \end{answer}

    \question[6] When was the Necronomicon written?
    \begin{answer}
        In the Age of Madness.
    \end{answer}

    \question[15] How many modes are there to skin a cat?
    \begin{choices}
        \choice 1
        \CorrectChoice\setcounter{correct}{\value{choice}} 20
        \choice 4
    \end{choices}
    \begin{answer}
        \Alph{correct}
    \end{answer}
    \question[4] What is \textbf{the} answer?
    \begin{choices}
        \CorrectChoice\setcounter{correct}{\value{choice}} 42.
        \choice 62.
        \choice 12.
        \choice 2. 
    \end{choices}
    \begin{answer}
        \Alph{correct}
    \end{answer}


\end{questions}


\showallanswers
\end{document}

正如代码中所注释的，我想添加以下功能：

  1. 让答案环境决定是否打印分数；如果问题没有分数，则不打印。我想这需要一个\ifpoints命令或类似的东西；我尝试阅读该课程的源代码exam，但我完全迷失了。
  2. 仅使用命令 \CorrectChoice 即可打印多项选择题中的正确答案，不带线条\setcounter{correct}{\value{choice}}。
  3. 执行上述所有操作，重新定义类solution中已经定义的环境exam。我试过了，但错误太多，而且在阅读类的代码时，我又一次迷失了方向。

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