\begin{center}\begin{minipage}{15cm}\begin{Verbatim}[frame=single]
> for i from 1 to 5 do print ("Hello world",i);
Hello world 1
Hello world 2
Hello world 3
Hello world 4
Hello world 5
> for i from 2 to 1 by -0.5 do print("Hello world",i);
Hello world 2
Hello world 1.5
Hello world 1
\end{Verbatim}
\end{minipage}\end{center}
