="nv">and</span> .<span class="nv">false</span>. <span class="nv">otherwise</span>
</code></pre></div>

<h2 id="examples">EXAMPLES</h2>
<p>Sample Program:</p>
<div class="codehilite"><pre><span></span><code> <span class="nv">program</span> <span class="nv">demo_isdigit</span>
 <span class="nv">use</span> <span class="nv">M_strings</span>, <span class="nv">only</span> : <span class="nv">isdigit</span>, <span class="nv">isspace</span>, <span class="nv">switch</span>
 <span class="nv">implicit</span> <span cla