title: Does "pointerVariable ==" mean something different from "pointerVariable="?
body: <p>For example: </p>
  
  <pre><code>node * curr;
  if(curr = NULL)
  </code></pre>
  
  <p>vs </p>
  
  <pre><code>node * curr;
  if(curr == NULL)
  </code></pre>
  
  <p>What do each of these things mean?</p>