Problem Statement

In this task, the goal is to demonstrate common operations on pointers and references. These examples show pointer operations on the stack, which can be dangerous and is rarely done. Pointers and references are commonly used along with Memory allocation on the heap.

Let's start with the solution:

(define B (box 42))
    → B ;; box reference
(unbox B)
    → 42 ;; box contents

;; sets new value for box contents
(define ( change-by-ref abox avalue) 
    (set-box! abox avalue) )
  
(change-by-ref B 666)
    → #[box 666]
(unbox B)
    → 666