r</span><span class="special">()</span> <span class="special">==</span> <span class="string">"inf"</span><span class="special">);</span>
<span class="keyword">double</span> <span class="identifier">r</span><span class="special">;</span>
<span class="identifier">ss</span> <span class="special">&gt;&gt;</span> <span class="identifier">r</span><span class="special">;</span> <span class="comment">// Read back in.</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier"