title: Javascript float subtract
body: <p>I was wondering how can I subtract two negative Floating-Point numbers in javascript. I tried:</p>
  
  <pre><code>alert(-0.2-0.1);
  </code></pre>
  
  <p>and the result is <code>-0.30000000000000004</code>. Am I doing something wrong? What do I have to do to get <code>-0.3</code> ?</p>