span class="identifier">Complex</span> <span class="identifier">den</span> <span class="special">=</span> <span class="identifier">z</span> <span class="special">+</span> <span class="identifier">x</span><span class="special">;</span>
  <span class="identifier">Complex</span> <span class="identifier">num</span> <span class="special">=</span> <span class="identifier">t</span><span class="special">*(</span><span class="identifier">z</span><span class="special">/</span><span class="identifier">pi</span><span c