Box around the code?

Question

I have a piece of code written as:
begin{lstlisting}
  code
end{lstlisting}

I want to put a box, around the code.
I have already read this question Source code listing with frame around code?
But I only want a simple box, not the title at the beginning

Rmano · Accepted Answer

The solution is around page 17 of the manual.
documentclass{article}
usepackage[T1]{fontenc}
usepackage[utf8]{inputenc}
usepackage{listings}
begin{document}
    begin{lstlisting}[frame=single]
    This is my
    code
    end{lstlisting}
end{document}

Produces:

In the manual you have a lot of possible options for the frame, and some warning on how to tweak things if the frames are "wrong" --- it is a good idea to read it!

Box around the code?

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