SICP Exercise 1.3 request for comments

Question

I\'m trying to learn scheme via SICP. Exercise 1.3 reads as follow: Define a procedure that takes three numbers as arguments and returns the sum of the squares of the two la

Answer 1

Below is the solution that I came up with. I find it easier to reason about a solution when the code is decomposed into small functions.

            ; Exercise 1.3
(define (sum-square-largest a b c)
  (+ (square (greatest a b))
     (square (greatest (least a b) c))))

(define (greatest a b)
  (cond (( > a b) a)
    (( < a b) b)))

(define (least a b)
  (cond ((> a b) b)
    ((< a b) a)))

(define (square a)
  (* a a))