</span><span class="special">)</span><span class="special">{</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"example 84:\n"</span><span class="special">;</span>
    <span class="identifier">input_safe_t</span> <span class="identifier">x</span><span class="special">,</span> <span class="identifier">y</span><span class="special">;</span>
    <span class="keyword">try</span><span class=