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I use listing typography C++ code, it performs very well when formatting LaTeX code, but it has very strange character output when used to typeset C++ code. Here is my WME：

documentclass{standalone} 



usepackage{tcolorbox,listings}

usepackage{listings}

usepackage{tikz}

usepackage{framed}



definecolor{background}{HTML}{EEEEEE}

definecolor{comments}{HTML}{868686}

definecolor{darkred}{RGB}{139,0,0}

definecolor{darkblue}{RGB}{0,0,139}

definecolor{chartreuse}{RGB}{127,255,0}

definecolor{drakgreen}{RGB}{0,128,0}

definecolor{lightgray}{RGB}{238,239,240}





lstset{

language=C++,

keywordstyle=color{darkblue},

basicstyle=normalfontttfamily,

commentstyle=color{comments}ttfamily,

stringstyle=rmfamily,

numbers=none,

numberstyle=scriptsize,

numbersep=8pt,

showstringspaces=false,

breaklines=true,

frameround=ftff,

%frame=single,

captionpos=t,

belowcaptionskip=0em,

belowskip=0em

}

lstdefinestyle{mystyle}{

language=C++,

extendedchars=true, 

breaklines=true,

breakatwhitespace=true,

basicstyle=ttfamily,

numbers=none

}



tcbuselibrary{listings,skins,breakable}

newtcblisting{code}{

arc=0mm,

top=0mm,

bottom=0mm,

left=3mm,

right=0mm,

width=textwidth,

boxrule=1pt,

%colback=blue!20,

colback=lightgray,

listing only,

listing options={style=mystyle},

breakable

}



begin{document}

begin{code}

#include <iostream>

#include <fstream>

#include <functional>

#include <chrono>



using namespace std;

using namespace std::chrono;



int fib(int n) {

    function<int (int,int,int)> iter;

    iter=[n,&iter](int a,int b,int i) {

        if(i>=n) {

            return a;

        }

        else {

            return iter(b,b+a,i+1);

        }

    };

    return iter(0,1,0);

}



uint64_t count = 0;



uint64_t fibonacci(int n)

{

    ++::count;

    if (::count - (::count >> 32 << 32) == 0)

        cout << ::count << "n";

    //++::count;

    if (n == 1 || n == 2) {

        return 1;

    }

    else

        return fibonacci(n - 1) + fibonacci(n - 2);

}



end{code}



end{document}

Where is the problem?

No errors or warnings.The resulting list is:

(c.listing) [1



] (c.aux)



 *File List*

standalone.cls    2018/03/26 v1.3a Class to compile TeX sub-files standalone

shellesc.sty    2016/06/07 v0.02a unified shell escape interface for LaTeX

ifluatex.sty    2016/05/16 v1.4 Provides the ifluatex switch (HO)

   ifpdf.sty    2018/09/07 v3.3 Provides the ifpdf switch

 ifxetex.sty    2010/09/12 v0.6 Provides ifxetex conditional

 xkeyval.sty    2014/12/03 v2.7a package option processing (HA)

 xkeyval.tex    2014/12/03 v2.7a key=value parser (HA)

standalone.cfg    2018/03/26 v1.3a Default configuration file for 'standalone' 

class

 article.cls    2014/09/29 v1.4h Standard LaTeX document class

  size10.clo    2014/09/29 v1.4h Standard LaTeX file (size option)

tcolorbox.sty    2018/07/26 version 4.14 text color boxes

     pgf.sty    2015/08/07 v3.0.1a (rcs-revision 1.15)

  pgfrcs.sty    2015/08/07 v3.0.1a (rcs-revision 1.31)

everyshi.sty    2001/05/15 v3.00 EveryShipout Package (MS)

  pgfrcs.code.tex

 pgfcore.sty    2010/04/11 v3.0.1a (rcs-revision 1.7)

graphicx.sty    2017/06/01 v1.1a Enhanced LaTeX Graphics (DPC,SPQR)

graphics.sty    2017/06/25 v1.2c Standard LaTeX Graphics (DPC,SPQR)

    trig.sty    2016/01/03 v1.10 sin cos tan (DPC)

graphics.cfg    2016/06/04 v1.11 sample graphics configuration

   xetex.def    2017/06/24 v5.0h Graphics/color driver for xetex

  pgfsys.sty    2014/07/09 v3.0.1a (rcs-revision 1.48)

  pgfsys.code.tex

pgfsyssoftpath.code.tex    2013/09/09  (rcs-revision 1.9)

pgfsysprotocol.code.tex    2006/10/16  (rcs-revision 1.4)

  xcolor.sty    2016/05/11 v2.12 LaTeX color extensions (UK)

   color.cfg    2016/01/02 v1.6 sample color configuration

 pgfcore.code.tex

pgfcomp-version-0-65.sty    2007/07/03 v3.0.1a (rcs-revision 1.7)

pgfcomp-version-1-18.sty    2007/07/23 v3.0.1a (rcs-revision 1.1)

verbatim.sty    2014/10/28 v1.5q LaTeX2e package for verbatim enhancements

 environ.sty    2014/05/04 v0.3 A new way to define environments

trimspaces.sty    2009/09/17 v1.1 Trim spaces around a token list

etoolbox.sty    2018/08/19 v2.5f e-TeX tools for LaTeX (JAW)

listings.sty    2018/09/02 1.7 (Carsten Heinz)

 lstmisc.sty    2018/09/02 1.7 (Carsten Heinz)

listings.cfg    2018/09/02 1.7 listings configuration

    tikz.sty    2015/08/07 v3.0.1a (rcs-revision 1.151)

  pgffor.sty    2013/12/13 v3.0.1a (rcs-revision 1.25)

 pgfkeys.sty    

 pgfkeys.code.tex

 pgfmath.sty    

 pgfmath.code.tex

  pgffor.code.tex

    tikz.code.tex

  framed.sty    2011/10/22 v 0.96: framed or shaded text with page breaks

lstlang1.sty    2018/09/02 1.7 listings language file

lstlang1.sty    2018/09/02 1.7 listings language file

 lstmisc.sty    2018/09/02 1.7 (Carsten Heinz)

pdftexcmds.sty    2018/09/10 v0.29 Utility functions of pdfTeX for LuaTeX (HO)

infwarerr.sty    2016/05/16 v1.4 Providing info/warning/error messages (HO)

 ltxcmds.sty    2016/05/16 v1.23 LaTeX kernel commands for general use (HO)

       c.listing

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