Evaluation examples

The symbol ``'' used in program examples should be read ``evaluates to.'' For example,


\begin{scheme} (* 5 8) \ev 40\end{scheme}

means that the expression (* 5 8) evaluates to the object 40. Or, more precisely: the expression given by the sequence of characters ``(* 5 8)'' evaluates, in the initial environment, to an object that may be represented externally by the sequence of characters ``40''. See section [*] for a discussion of external representations of objects.