title: when directly sum up every individual element in a string to int, what is the value represent?
body: <p>like when when s = "wendy", I got 551. What's that?</p>
  
  <pre><code>for(size_t i = 0; i &lt; s.length(); i++)
  {
      sum += s.at(i);
  }
  </code></pre>