title: C language, How to include a file from "XXX.h" to <XXX.h>", maybe using Makefile?
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/21593/what-is-the-difference-between-include-filename-and-include-filename">What is the difference between #include &lt;filename&gt; and #include &ldquo;filename&rdquo;?</a>  </p>
  </blockquote>
  
  
  
  <p>I just got involved into a project.</p>
  
  <p>When I were tracing the project code, I found that</p>
  
  <p>some people can include a header file by this way:</p>
  
  <p>include &lt; XXX.h ></p>
  
  <p>XXX.h is a header file that is not in system libraries and made by our own programmers...</p>
  
  <p>My question is how to use '&lt;' and '>' instead of double " ?</p>
  
  <p>and how to include headers in other directories by this way?</p>
  
  <p>for example:</p>
  
  <p>headers/header_a.h
  headers/header_b.h</p>
  
  <p>I can use include &lt; header_a.h > and &lt; header_b.h >...</p>
  
  <p>should I use Makefile to implement this? thanks..</p>