ed&rsquo; by filling
the nonterminal&rsquo;s array element with a pointer to that particular tag.
params[0] (the first array element) captures nonterminal &lsquo;A&rsquo;,
params[1] captures &lsquo;B&rsquo;, and so forth.
A simple macro can be used
to find the array element that belongs to a given nonterminal.
</p>
<table><tr>
<td class="snippet">#define paramByLetter(letter)   (params + (letter) - 'A')
</td>
</tr></table>
<p>
Note: you may find the array length of 26 a bit over the top,
but it does save me