title: sas difference between sum and +?
body: <pre><code>data whatever;
   infile '';
   input price cost;
   &lt;statement&gt;;
  run;
  </code></pre>
  
  <p>In <code>&lt;statement&gt;</code>, what's the difference between using <code>total = sum(total,cost)</code> and <code>total = total + cost</code> ?</p>