title: Negative powers of 2 in C
body: <p>I am trying to avoid the use of <code>pow</code> in C.</p>
  
  <p><code>pow(2,16)</code> can be written as <code>1&lt;&lt;16</code>, but how do I represent <code>pow(2,-16)</code>? If I do <code>1/(1&lt;&lt;16)</code>, I get 0.</p>
  
  <p>Can anyone help please?</p>