title: How can I increment a value in scheme with closure?
body: <p>How can I increment a value in scheme with closure? I'm on lecture 3A in the sicp course.</p>
  
  <pre><code>(define (sum VAL)
  
      // how do I increment VAL everytime i call it?
  
      (lambda(x)  
          (* x x VAL)))
  
  (define a (sum 5))
  
  (a 3)
  </code></pre>