1 \frametitle {Basic looping}

     2   \begin{lstlisting}

     3 # Fibonacci series:

     4 # the sum of two elements

     5 # defines the next

     6 a, b = 0, 1

     7 while b < 10:

     8     print b,

     9     a, b = b, a + b

    10 

    11 \end{lstlisting}

    12 \typ{1 1 2 3 5 8}\\

    13 \alert{Recall it is easy to write infinite loops with \kwrd{while}}

    14   \inctime{20}