an class="keyword">if</span><span class="special">(!</span><span class="identifier">in</span><span class="special">)</span> <span class="keyword">return</span><span class="special">;</span>
                <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">setw</span><span class="special">(</span><span class="identifier">width</s