Putting pseudocode in a framed box

Question

I added some pseudocode to my document in this style:

\usepackage{algpseudocode}

\begin{algorithmic}[1]
\If {$i\geq maxval$}
\State $i\gets 0$
\Else
\If {$i+k\leq maxval$}
    \State $i\gets i+k$
\EndIf
\EndIf
\end{algorithmic}

I want my pseudocode to appear in a box, i.e. framed.

I tried

\framebox{ 
    \begin{algorithmic}[1] ...     
    \end{algorithmic} 
}

but that gave me tons of errors and didn't divide the code on multiple lines.

How can I frame my pseudocode?

Answer 1

Using \varwidth you can set an upper limit as the width of the line minus the space taken up by the box margins, but allow it to shrink if possible to the longest line of the display

\documentclass{article}
\usepackage{varwidth}

\usepackage{algpseudocode}

\begin{document}
\noindent\fbox{%
\begin{varwidth}{\dimexpr\linewidth-2\fboxsep-2\fboxrule\relax}
\begin{algorithmic}[1]
\If {$i\geq maxval$}
\State $i\gets 0$
\Else
\If {$i+k\leq maxval$}
    \State $i\gets i+k$
\EndIf
\EndIf
\end{algorithmic}
\end{varwidth}% 
}

\end{document}

Answer 2

You only need to adjust the minipage's width to avoid overfull.

Edit: adding some comments from David.

\noindent\fbox{%
\begin{minipage}{\dimexpr\linewidth-2\fboxsep-2\fboxrule\relax}
\begin{algorithmic}[1]
\If {$i\geq maxval$}
\State $i\gets 0$
\Else
\If {$i+k\leq maxval$}
    \State $i\gets i+k$
\EndIf
\EndIf
\end{algorithmic}
\end{minipage}% 
}