cial">::</span><span class="identifier">string</span> <span class="identifier">_name</span><span class="special">;</span>
<span class="keyword">public</span><span class="special">:</span>
   <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">name</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">float</span>  <span class="identifier">calculate</span><sp