% ---------------------------------------------------------------------------- %
% File
begin{filecontents*}{jobname.cpp}
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0000
end{filecontents*}
begin{filecontents*}{multijobname.cpp}
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0000
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0000
end{filecontents*}
% ---------------------------------------------------------------------------- %
% Preamble
documentclass[letterpaper, 12pt, onecolumn]{article}
% ---------------------------------------------------------------------------- %
% Packages
usepackage{xcolor}
usepackage{listings}
usepackage{multicol}
usepackage[most]{tcolorbox}
% ---------------------------------------------------------------------------- %
% Listings options
definecolor{grey}{RGB}{224, 224, 224}
newtcbinputlisting{inputcode}[4][normalsize]{
    code = {},
    enhanced,
    listing only,
    top = 0pt,
    bottom = 0pt,
    left = 0pt,
    right = 0pt,
    arc = 0pt,
    outer arc = 0pt,
    boxsep = 0pt,
    titlerule = 0pt,
    colback = grey,
    colframe = black,
    boxrule = 2pt,
    title = {centering{fontfamily{cmtt}selectfont#2strut}},
    listing options = {
        language = C++,
        framesep = 0pt,
        rulesep = 0pt,
        aboveskip = 0pt,
        belowskip = 0pt,
        basicstyle = fontfamily{cmtt}selectfont#1,
        #3,
    },
    listing file={#4},
}
% ---------------------------------------------------------------------------- %
% Commands
newcommand{alphabet}{small{ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz}}
newcommand{makelisting}[2]{
newpagenoindentalphabet
inputcode[#1]{#2}{}{jobname.cpp}
noindentalphabet
inputcode[#1]{#2}{multicols = 2}{multijobname.cpp}
noindentalphabet
}
% ---------------------------------------------------------------------------- %
% Document
begin{document}
makelisting{tiny}{tiny}
makelisting{scriptsize}{scriptsize}
makelisting{footnotesize}{footnotesize}
makelisting{small}{small}
makelisting{normalsize}{normalsize}
makelisting{large}{large}
makelisting{Large}{Large}
makelisting{LARGE}{LARGE}
makelisting{huge}{huge}
makelisting{Huge}{Huge}
end{document}
% ---------------------------------------------------------------------------- %