努力解决习题集中示例和练习的计数器问题

Question

我想要两个计数器，部分和练习次数。我有这个示例代码

\documentclass[12pt]{article}
\usepackage{fontspec}
\usepackage{polyglossia}

\newcounter{header}
\setcounter{header}{1}

\newcommand{\Header}[1]{ 
    \begin{center}
        #1 Practices Set \theheader 
        \setcounter{exercice}{0}  
        \addtocounter{header}{1}
    \end{center}
}

\newtheorem{exercice}{Exercice}[header]

\begin{document}
    \Header{Matrices.}
    \begin{exercice} This is the first Exercise of Set 1 numbered as 2.1. I would like to number it as 1.1
    \end{exercice}
\begin{exercice} This is the second Exercise of Set 1 numbered as 2.2. I would like to number it as 1.2
    \end{exercice}
    \Header{Systems of Linear Equations.}   
    \begin{exercice}
        This is the first Exercise of Set 2  numbered as 3.1. I would like to number it as 2.1
    \end{exercice} 
\end{document}

Answer 1

这解决了你的问题，甚至可以引用标题

\newcounter{header}

\newcommand{\Header}[1]{
  \refstepcounter{header}
    \begin{center}
        #1 Practices Set \theheader 
    \end{center}
}

首先，的起始值header应为 0（默认情况下为 ，您实际上可以删除\setcounter{header}{0}）。其次，header在使用它之前，您应该对其进行升级，\Header否则就没有意义了。第三，正如您使用 一样\newtheorem{exercice}{Exercice}[header]，exercise每当 发生变化时都会自动重置header，因此无需手动执行此操作。