<span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>

   <span class="comment">// 0.16636938378681407351267852431513159437103348245333</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">setprecision</span><span class="special">(</span>