定义保存百分比的变量

Question

我想在 tex 文档中定义一些变量。例如，我写入.tex类似以下内容：Our tool succeeds to validate x samples out of all the y samples, thus its success ratio is z。其中z定义为x/y，并且x（分别为y）在其他地方以数字形式实例化，例如30（分别为47）。结果，编译后文本变为Our tool succeeds to validate 30 samples out of all the 47 samples, thus its success ratio is 63.8%。

这样做的好处是，我只需要改变一些变量的值，就可以改变文本中的所有数字......困难在于z保存百分比数字。

有人知道如何实现这一点吗？

Answer 1

\documentclass{article}
\usepackage{xintfrac}

\newcommand\x{30}
\newcommand\y{47}


\newcommand\mypercent[3][1]{\xintRound {#1}{\xintE{#2/#3}{2}}\%}

\begin{document}\thispagestyle{empty}

Our tool succeeds to validate \x\ samples out of all the \y\ samples, thus its
success ratio is  
\mypercent{\x}{\y}.

Our competitor validated only 1 sample out of 31. Her success ratio is thus
\mypercent{1}{31}, or, more precisely \mypercent [3]{1}{31}.

\end{document}

Answer 2

\documentclass{article}

\newcommand\x{30}
\newcommand\y{47}


\newcommand\mypercent[2]{%
\expandafter\myadddot\the\numexpr 10000*(#1)/(#2)\relax\relax\%}

\def\myadddot#1#2#3{%
\ifx\relax#3%
.#1%
\else
#1\expandafter\myadddot\fi
#2#3}

\begin{document}


Our tool succeeds to validate \x\ samples out of all the \y\ samples, thus its success ratio is 
\mypercent{\x}{\y}


\end{document}

或 1dp

\newcommand\mypercent[2]{%
\expandafter\adddot\the\numexpr 1000*(#1)/(#2)\relax\relax\%}

\def\adddot#1#2{%
\ifx\relax#2%
.#1%
\else
#1\expandafter\adddot\fi
#2}

Answer 3

您还可以使用pgf数学引擎：

笔记：

• 可选的第一个参数可用于控制显示的小数位数——如果未指定，则默认为 2 位数字。

代码：

\documentclass{article}
\usepackage{tikz}

\newcommand\x{30}
\newcommand\y{47}


\newcommand{\MyPercent}[3][2]{%
    \pgfmathparse{100*#2/#3}%
    \pgfmathprintnumber[fixed,precision=#1]{\pgfmathresult}\%%
}%


\begin{document}

Our tool succeeds to validate \x\ samples out of all the \y\ samples, thus its success ratio is 
\MyPercent{\x}{\y}, or with more digits \MyPercent[5]{\x}{\y}.

\end{document}

Answer 4

强制解决方案expl3；可选参数是小数位数（默认为 0）；结果四舍五入。

\documentclass{article}
\usepackage{xparse}

\ExplSyntaxOn
\DeclareExpandableDocumentCommand\mypercent{O{0}mm}
 {
  \fp_eval:n { round ( 100 * #2/#3 , #1 ) } \%
 }
\ExplSyntaxOff

\newcommand\x{30}
\newcommand\y{47}

\begin{document}

Our tool succeeds to validate \x\ samples out of all the \y\ samples, thus its
success ratio is
\mypercent{\x}{\y}.

Our competitor validated only 1 sample out of 31. Her success ratio is thus
\mypercent{1}{31}, or, more precisely \mypercent [3]{1}{31}.

\end{document}