title: What does the vertical pipe ( | ) mean in C++?
body: <p>I have this C++ code in one of my programming books:</p>
  
  <pre><code>WNDCLASSEX wndClass = { 0 };
  wndClass.cbSize = sizeof(WNDCLASSEX);
  wndClass.style =  CS_HREDRAW | CS_VREDRAW;
  </code></pre>
  
  <p>What does the single pipe do in C++ windows programming?</p>