title: What is the C++ equivalent of Python's append method?
body: <p>Consider following code in python</p>
  
  <pre><code>li = [1,2,3]
  li.append(4)
  </code></pre>
  
  <p>If you call li now, output will be:</p>
  
  <pre><code>[1,2,3,4]
  </code></pre>
  
  <p>If you replicate code above using C++, what would it be?</p>