title: including header files from different directories?
body: <p>I am working on a project and I keep getting stumped on how I am supposed to import files from a different directory. Here is how some of my files are organized:</p>
  
  <pre><code>-stdafx.h
  -core/
  --&gt;renderer.cpp
  -shapes/
  --&gt;sphere.h
  --&gt;sphere.cpp
  </code></pre>
  
  <p>how can i access the <code>stdafx.h</code> and <code>shapes/sphere.h</code> from the <code>core/renderer.cpp</code>?</p>