About the system in vc
<p>I run below code in vc.</p>

<pre><code> system("@echo off");
 system("set a=3");
 system("echo %a%");
 system("pause");
</code></pre>

<p>but it display as '%a%', but I require display as '3'.</p>

<p>How Can I make it? 
Thanks very much for your help.</p>
