an> <span class="identifier">dist</span> <span class="special">&lt;&lt;</span> <span class="string">" over unit sphere"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span>
        <span class="special">&lt;&lt;</span> <span class="identifier">dist</span> <span class="special">*</span> <span class="number">3959</span>  <span class="special">&lt;&lt;</span> <span class="string">" over a spherical earth, in miles"</