"number">0</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">vec</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="number">2</span><span class="special">.</span><span class="number">3</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">vec</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="