SICP Exercise 2.2

sicp_2.2.scm

;; 2.2
;; SICP Exercise 2.2

;; takes x and y coordinates to create a point
(define (make-point x y)
  (cons x y))

(define (make-segment x1 y1 x2 y2)
  ;; needs implementation
  (let 
  (= start-segment (make-point x1 y1)
  (= end-segment (make-point x2 y2))


)

;; a line is define by two points, or segments.

(define (start-segment line)
  ;;completed for you:
  (car line)

)

(define (end-segment line)
  ;; code goes here
  (car line) ;;???????
)

;; What is a begining or end segment? they are a point which is
;; represented as a cons. So we need:
(define (x-point p)
  (car p))
(define (y-point p)
  (cdr p))
)


;; this should be taking a single line segment as an argument
(define (midpoint-segment segment)
  ;;hint: find the midpoint-x position
  ;;hint: find the midpoint-y position
)