title: C++ Assert Message
body: <p>Im really quickly trying to figure out what the "custom message" of an assert does. I can't seem to find the answer.</p>
  
  <p>ie: </p>
  
  <pre><code>int x = -1; 
  assert (x &gt; 0 &amp;&amp; "Number must be above 0");
  </code></pre>
  
  <p>Where does the message actually output? Because it sure isn't being displayed when I try it.</p>