My switch structure dosent seem to work(JavaScript control structure)
<p>Nothing shows up in browser and since JavaScript doesn't have a compiler to run it though I am not sure how to check for errors in this language.</p>

<p>my HTML</p>

<pre class="lang-html prettyprint-override"><code>&lt;!doctype html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;Where am I?&gt;&lt;/title&gt;
    &lt;script src="script4.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;/body&gt;
&lt;/html&gt; 
</code></pre>

<p>My script4.js</p>

<pre class="lang-javascript prettyprint-override"><code>var number = 20;
switch(number) {
  case number &gt; 0:
    alert(number + " is Positive");
    break;
  case number ===  0:
    alert(number + " is zero");
    break;
  case number &lt; 0;
    alert(number + " is negative");
  default:
    alert(number + " is not a number");
}
</code></pre>
