title: vim: How do I map number keys?
body: <p>Not sure why this isn't working, but I can't map Ctrl+NUMBER to a command in vim.</p>
  
  <p>For example this works:</p>
  
  <pre><code>nnoremap &lt;C-r&gt; :bufdo bdelete&lt;cr&gt;
  </code></pre>
  
  <p>This doesn't:</p>
  
  <pre><code>nnoremap &lt;C-8&gt; :bufdo bdelete&lt;cr&gt;
  </code></pre>
  
  <p>Do I have to do something special in order to map number keys?</p>
  
  <p><code>gvim 7.4, Windows 7</code></p>