title: why %include doesn't work?
body: <p>I have one main program <code>Main.sas</code> and several sub programs. </p>
  
  <p>In <code>Main.sas</code>, I define several macro variables. </p>
  
  <pre><code>%let startdate = ..;
  %let enddate = ..;
  %let path = ....;
  </code></pre>
  
  <p>Then I call sub programs via <code>%include</code></p>
  
  <pre><code>%include "&amp;path.\print1.sas";
  </code></pre>