to the complex scalar <code>z</code>.
The right-hand side expression can be a call to a user defined
function, allowing general algorithms to be applied that might not be
otherwise expressible as simple expressions (e.g., iterative or
recursive algorithms).</p>
</div>
<div id="scope-within-expressions" class="section level3 unnumbered">
<h3>Scope within expressions</h3>
<p>Any variable that is in scope and any function that is available in
the block in which the compound declaration and definition appears m