de> for grouping statements.</p>
<p>With parentheses it is possible to explicitly group subexpressions
with operators. Without parentheses, the expression <code>1 + 2 * 3</code>
has a subexpression <code>2 * 3</code> and evaluates to 7. With
parentheses, this grouping may be made explicit with the expression
<code>1 + (2 * 3)</code>. More importantly, the expression <code>(1 + 2) *   3</code> has <code>1 + 2</code> as a subexpression and evaluates to 9.</p>
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            </section>

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