title: How do I represent a Unicode character in a literal string ISO/ANSI C when the character set is ASCII?
body: <p>In Perl, I can say</p>
  
  <pre><code>my $s = "r\x{e9}sum\x{e9}";
  </code></pre>
  
  <p>to assign <code>"résumé"</code> to <code>$s</code>.  I want to do something similar in C.  Specifically, I want to say</p>
  
  <pre><code>sometype_that_can_hold_utf8 c = get_utf8_char();
  if (c &lt; '\x{e9}') {
      /* do something */
  }
  </code></pre>