title: Scheme: Cond "not equal"
body: <p>I'd like to do this in scheme:</p>
  
  <pre><code>if ((car l) != (car (cdr (order l))) do something
  </code></pre>
  
  <p>in particular I wrote this:</p>
  
  <pre><code>((eq? (car l) (car (cdr (order l))) ) 
   (cons (count (car (order l)) (order l)) 
         (count_inorder_occurrences (cdr (order l))))) 
  </code></pre>
  
  <p>but it compares <code>(car l)</code> with <code>(car (cdr (order l))</code> for equality.
  I want instead to do something only if <code>eq?</code> is false. How can I do that in my example?</p>
  
  <p>Thanks</p>