title: Get length of string array of unknown length
body: <p>I have this function:</p>
  
  <pre><code>int setIncludes(char *includes[]);
  </code></pre>
  
  <p>I don't know how many values <code>includes</code> will take. It may take <code>includes[5]</code>, it may take <code>includes[500]</code>. So what function could I use to get the length of <code>includes</code>?</p>