title: Passing by reference in Xcode, C language
body: <p>I'm implementing stack in C and I define pop function in C file:</p>
  
  <pre><code>int pop(int &amp;x, int &amp;y);
  </code></pre>
  
  <p>Xcode shows error (pointing on the first argument): Expected ')'
  Any ideas why I have that problem? Thanks.</p>