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Use of continuations for escaping purposes
We here illustrate applications of the continuations for escaping purposes
Context C, capturing, and escape call

 Value

(+ 5 
 (call/cc 
  (lambda (e)
   (* 4 (e 10)))) )
 
15
(cons 1 
 (call/cc
  (lambda (e)
   (cons 2 
    (cons
     3 (e 'x))))) )
 
(1 . x)
(define x 5)

(if (= 0 x)
    'undefined
    (call/cc 
     (lambda (e)
      (remainder 
       (* (+ x 1)
          (- x (e 111)))
       x))) )
 
111