title: cin.getline() without using string size
body: <p>Is it possible to use <code>cin.getline()</code> without denoting an array size? 
  That is, with the following pseudo-code:</p>
  
  <pre><code>char array[15];
  cin.getline(array,'.');  // '.' Is the delimiter.
  </code></pre>
  
  <p>Will this work?</p>