在下面的代码中，文档中有两部分。第一部分包含一个 Question 然后是 Answer，第二部分包含一个 Problem 然后是 Answer。
对于第 1 部分，我希望将文档格式化，使其看起来像这样：
问题 1
Q1 问题 1
...
AQ1 答案 1
...
问题2
Q2 问题 2
...
AQ2 答案 2
...
那么对于第 2 部分，格式应如下所示：
问题 1
P1 问题 1
...
AP1 答案 1
...
问题 2
P2 问题 2
...
AP2 答案 2
...
以下是目前编写的代码：
\documentclass{book}
\usepackage[top=3cm,bottom=3cm,left=3.2cm,right=3.2cm,headsep=10pt,letterpaper]{geometry}
\usepackage{rotating, ltablex, dcolumn}
\usepackage{lipsum}
\usepackage[english]{babel}
\usepackage{booktabs}
\usepackage{tikz}
\usepackage{pgfplots,pgfplotstable}
\usepackage{titletoc}
\begin{document}
\mainmatter
\part{Questions}
\chapter{Question 1}
\section{Question 1 }
\section{Answer 1 }
\chapter{Question 2}
\section{Question 2 }
\section{Answer 2 }
\chapter{Question 3}
\section{Question 3}
\section{Answer 3}
\chapter{Question 4}
\section{Question 4}
\section{Answer 4}
\chapter{Question 5}
\section{Question 5}
\section{Answer 5}
\chapter{Question 6}
\section{Question 6}
\section{Answer 6}
\chapter{Question 7}
\section{Question 7}
\section{Answer 7}
\part{Problems}
\chapter{Problem 1}
\section{Problem 1}
\section{Answer 1}
\chapter{Problem 2}
\section{Problem 2}
\section{Answer 2}
\chapter{Problem 3}
\section{Problem 3}
\section{Answer 3}
\chapter{Problem 4}
\section{Problem 4}
\section{Answer 4}
\end{document}
答案1
这使用一个开关来控制各个样式，\questionanswer用于第一部分和\problemanswer第二部分。
检查\if@questionmode当前section是问题还是答案——假设问题之间没有间隙！
\documentclass{book}
\usepackage[top=3cm,bottom=3cm,left=3.2cm,right=3.2cm,headsep=10pt,letterpaper]{geometry}
\usepackage{rotating, ltablex, dcolumn}
\usepackage{lipsum}
\usepackage[english]{babel}
\usepackage{booktabs}
\usepackage{tikz}
\usepackage{pgfplots,pgfplotstable}
\usepackage{titletoc}%
\usepackage{xparse}
\usepackage{chngcntr}
\counterwithout{section}{chapter}
\counterwithin{section}{part}
\makeatletter
\let\latex@@thesection\thesection
\newif\if@questionmode
\newif\if@problemanswermode
\newcommand{\problemprefix}{P}
\newcommand{\problemanswerprefix}{A\problemprefix}
\newcommand{\questionprefix}{Q}
\newcommand{\questionanswerprefix}{A\questionprefix}
\DeclareRobustCommand{\questionanswerformat}{%
\if@questionmode%
\questionprefix\arabic{section}%
\global\@questionmodefalse
\else
\addtocounter{section}{-1}%
\questionanswerprefix\arabic{section}%
\global\@questionmodetrue
\fi
}
\DeclareRobustCommand{\problemanswerformat}{%
\if@questionmode%
\problemprefix\arabic{section}%
\global\@questionmodefalse
\else
\addtocounter{section}{-1}%
\problemanswerprefix\arabic{section}%
\global\@questionmodetrue
\fi
}
\newcommand{\questionanswer}{%
\@questionmodetrue
\renewcommand{\thesection}{%
\questionanswerformat%
}%
}
\newcommand{\problemanswer}{%
\@questionmodetrue
\renewcommand{\thesection}{%
\problemanswerformat%
}%
}
\makeatother
\usepackage{hyperref}
\begin{document}
\tableofcontents
\mainmatter
\part{Questions}
\questionanswer
\chapter{Question 1}
\section{Question 1 }
\section{Answer 1 }
\chapter{Question 2}
\section{Question 2 }
\section{Answer 2 }
\chapter{Question 3}
\section{Question 3}
\section{Answer 3}
\chapter{Question 4}
\section{Question 4}
\section{Answer 4}
\chapter{Question 5}
\section{Question 5}
\section{Answer 5}
\chapter{Question 6}
\section{Question 6}
\section{Answer 6}
\chapter{Question 7}
\section{Question 7}
\section{Answer 7}
\part{Problems}
\problemanswer
\chapter{Problem 1}
\section{Problem 1}
\section{Answer 1}
\chapter{Problem 2}
\section{Problem 2}
\section{Answer 2}
\chapter{Problem 3}
\section{Problem 3}
\section{Answer 3}
\chapter{Problem 4}
\section{Problem 4}
\section{Answer 4}
\end{document}