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;;; Under Creative Commons Attribution-ShareAlike 4.0
;;; International. See
;;; <https://creativecommons.org/licenses/by-sa/4.0/>.
(define-module (one three)
#:export (square sum-of-squares largest first-arg-2nd-largest-p
sum-of-squares-of-largest-two))
(define (square x) (* x x))
(define (sum-of-squares x y)
(+ (square x) (square y)))
(define (largest x y z)
(cond ((and (>= x y)
(>= x z)) x)
((and (>= y x)
(>= y z)) y)
((and (>= z x)
(>= z y)) z)))
(define (first-arg-2nd-largest-p x y z)
(or (and (>= x y)
(<= x z))
(and (<= x y)
(>= x z))
))
(define (sum-of-squares-of-largest-two x y z)
(sum-of-squares (largest x y z)
(cond ((first-arg-2nd-largest-p x y z)
x)
((first-arg-2nd-largest-p y x z)
y)
((first-arg-2nd-largest-p z x y)
z))))
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