title: Are these two expressions equivalent
body: <pre><code>int x, N;
  </code></pre>
  
  <p>and N is always positive.  Are the following two lines equivalent?     </p>
  
  <pre><code>if (x&gt;=0 &amp;&amp; x&lt;N)    
  
  if ( (unsigned)x &lt; (unsigned)N )
  </code></pre>