What is the meaning of the special char in constant value
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/685962/list-of-net-numeric-type-initialization-identifiers">List of .Net Numeric Type Initialization Identifiers</a>  </p>
</blockquote>



<p>What means the "D" in the following expression ?</p>

<pre><code>Double total;

...

total = 30D;
</code></pre>
