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% http://tex.stackexchange.com/questions/131546/
\documentclass{article}
\usepackage{xcolor}
\usepackage{listings}
\usepackage{xsim}
\lstset{
frame=single,
xleftmargin=20pt,
numbers=left,
numberstyle=\small,
tabsize=2,
breaklines,
showspaces=false,
showstringspaces=false,
language=C,
basicstyle=\small\ttfamily,
commentstyle=\itshape\color{gray}
}
\begin{document}
\begin{exercise}[points=6]
Consider the following C program.
\begin{lstlisting}
#include <stdio.h>
int main(int argc, char *argv[]) {
printf("hello, world\n");
}
\end{lstlisting}
\end{exercise}
\begin{solution}
Consider the following C program.
\begin{lstlisting}
#include <stdio.h>
int main(int argc, char *argv[]) {
printf("hello, world\n");
}
\end{lstlisting}
\end{solution}
\pagebreak
\printsolutions
\end{document}
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