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创建奇数答案或所有答案

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创建奇数答案或所有答案

我从头开始创建解决方案手册。我希望能够通过设置开关，只生成每个部分中奇数问题的解决方案，或生成所有问题的解决方案。

我更倾向于不使用其中一个答案包，因为我过去使用这些答案包并没有取得很大的成功。我首选的解决方案是修改分项列表宏，使它们在特定情况下不会产生任何输出。或者还有其他更好的方法吗？

我应该补充一点，练习将按章节.部分.# 进行编号，并且# 是偶数还是奇数应该决定包含的内容。

我想我没有提供足够的信息来给出一个像样的答案，但我不确定还能说些什么......

答案1

下面展示的可能是您正在寻找的概念证明。

使用的软件包包括

  • enumitem：用于列表的高级操作；以及
  • environ：为了允许可能包含段落的较长答案。

布尔值oddonly用于确定是否仅打印奇数答案。使用将其设置为true或（其中是或）。两个计数器分别用于对问题和答案进行编号。如上所述，定义环境（和）的原因是因为您可能希望在问题/答案中包含大量描述，而该包对此很有用。false\oddonly<bool><bool>truefalsequestionanswerenviron

\documentclass{book}
\usepackage{enumitem}% http://ctan.org/pkg/enumitem
\usepackage{environ}% http://ctan.org/pkg/environ
\begin{document}

\newif\ifoddonly% Boolean to print odd-only answers
\oddonlytrue% Odd only answers = TRUE
\newcounter{question}[section]% Question counter (within section)
\newcounter{answer}[section]% Answer counter (within section)

\NewEnviron{question}{\stepcounter{question}\item \BODY}% Question
\NewEnviron{answer}{% Answer
  \stepcounter{answer}%
  \ifodd\value{answer}% Condition on value of answer
    \item \BODY% Print odd answer
  \else\ifoddonly\else
      \item \BODY% Print even answer
  \fi\fi%
}

% QUESTIONS ===========

\chapter{Some chapter}
\section{Questions} \label{questions}

\begin{enumerate}[label=\arabic{chapter}.\arabic{section}.\arabic{question})]
  \begin{question} Here is a question? \end{question}
  \begin{question} Here is another question? \end{question}
  \begin{question} This is yet another question? \end{question}
  \begin{question} Oh, and another one? \end{question}
  \begin{question} Here's the final question? \end{question}
\end{enumerate}

% ANSWERS =============

\section{Answers to Section~\ref{questions}}

\begin{enumerate}[label=\ref{questions}.\arabic{answer})]
  \begin{answer} Answer to this question. \end{answer}
  \begin{answer} Answer to that question. \end{answer}
  \begin{answer} Answer to another question. \end{answer}
  \begin{answer} Answer to fourth question. \end{answer}
  \begin{answer} Final answer. \end{answer}
\end{enumerate}

\end{document}

仅限奇数答案

\oddonlyfalse在上面的例子中设置（默认值）会产生：

全部答案

您可能想要尝试列表标签的对齐方式。但是，为此，我建议您查看enumitem包装文档。

答案2

我知道您不想使用该answers包来解决问题，但对于任何感兴趣的人，我在下面提供了一个解决方案，这是我用于此任务的精简版。

您可以使用以下开关显示/隐藏奇数（或偶数，或两者）编号的解决方案，设置为 1（显示）或 0（隐藏）：

\setcounter{showodd}{1}
\setcounter{showeven}{1}

代码：

\documentclass{report}
\usepackage{ifthen}                        % conditionals
\usepackage{answers}                       % solutions to problems
\usepackage{xstring}                       % used to determine if problems are odd or even

% question environment 
\newcounter{question}
\setcounter{question}{0}
\renewcommand{\thequestion}{\thesection.\arabic{question}}
\newenvironment{question}{\refstepcounter{question}\thequestion.}{}

% open the solutions file
\Opensolutionfile{shortsolutions}
\Newassociation{shortsolution}{shortSoln}{shortsolutions}

\setlength{\parindent}{0mm}

\begin{document}

\chapter{Some chapter}
\section{Questions}

\begin{question}
Here's  a question.
\begin{shortsolution}
First answer.
\end{shortsolution}
\end{question}

\begin{question}
Another question.
\begin{shortsolution}
Second answer.
\end{shortsolution}
\end{question}

\begin{question}
Here's  a question.
\begin{shortsolution}
Third answer.
\end{shortsolution}
\end{question}

\begin{question}
Another question.
\begin{shortsolution}
Fourth answer.
\end{shortsolution}
\end{question}


% close the solutions files
\Closesolutionfile{shortsolutions}

% set up switches to show odd or even problems
%   1: show
%   0: don't show (actually, anything other than 1 makes it not show)
\newcounter{showodd}
\newcounter{showeven}
\setcounter{showodd}{1}
\setcounter{showeven}{1}

% solution to problem (show only odd, even, all)
% Note: this renewenvironment needs to go here
%       so that the answers package can still
%       display correctly to the page if needed
\newcounter{oddproblemnumber}
\renewenvironment{shortSoln}[1]{%
    % before the environment starts
    \fullexpandarg % need this line so that '.' are counted
        % numbers such as 1.3.1, 1.2.4, 7.5.6
        \StrBehind{#1}{.}[\newbit]%
        \StrBehind{\newbit}{.}[\problemnumber]%
     % determine if the problem number is odd or even
     % and depending on our choices above, display or not
     \ifthenelse{\isodd{\problemnumber}}%
     {%
         % set a counter that says the problem number is odd (used later)
         \setcounter{oddproblemnumber}{1}%
         % display or not 
         \ifthenelse{\theshowodd=1}
         {%
            % if we want to show the odd problems
            {\par\bfseries #1.}%
         }%
         {%
            % otherwise don't show them!
            \expandafter\comment%          
         }%
     }%
     {%
         % even numbered problem, set the counter (used later)
         \setcounter{oddproblemnumber}{0}%
         \ifthenelse{\theshoweven=1}
         {%
            % if we want to show the even problems
            {\par\itshape #1.}%
         }%
         {%
            % otherwise don't show them!
            \expandafter\comment%          
         }%
     }%
}%
{%
    % after the environment finishes
    \ifthenelse{\theoddproblemnumber=1}%
    {%
        % odd numbered problems 
         \ifthenelse{\theshowodd=1}
         {%
            % if we want to show the odd problems
            % then the environment is finished
         }%
         {%
            % otherwise we need to finish the comment
            \expandafter\endcomment%
         }%
    }%
    {%
        % even numbered problems
         \ifthenelse{\theshoweven=1}
         {%
            % if we want to show the even problems
            % then the environment is finished
         }%
         {%
            % otherwise we need to finish the comment
            \expandafter\endcomment%
         }%
    }%
}


\newpage
\section{Answers}
\IfFileExists{shortsolutions.tex}{\input{shortsolutions.tex}}{}


\end{document}

答案3

我不知道这是否对你有帮助，但我创建条件文档的方法是使用版本包。使用此包，您可以通过以下方式包含选定区域：

\begin{VERSIONfinal}
This text will only appear if VERSIONfinal is included
\end{VERSIONfinal}

在之后的某个时间，您必须使用或\begin{document}来包含或排除特定版本。\includeversion{VERSIONfinal}\excludeversion{VERSIONfinal}

注意：还有一个版本包，到目前为止我还没有使用它。

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