6>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">demo</span>
<span class="special">{</span>
    <span class="keyword">int</span> <span class="identifier">plus</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">a</span><span class="special">,</span> <span class="keyword">int</span> <span class="identifier">b</span><span class="special">)</span>
    <span class="special">{</span>
        <span class="keyword">return</span