; f2c : num -> num
; Converts F-degrees f to C-degrees
(define (f2c f)
  (* (- f 32) 5/9))
(f2c 32) "should be" 0
(f2c 212) "should be" 100

;; short-walk? : num -> bool
;; To determine whether d is between 0 and 100, inclusive
(define (short-walk? d)
  (and (>= d 0) 
       (<= d 100)))
(short-walk? 10) "should be" true
(short-walk? -3) "should be" false
(short-walk? 0) "should be" true
(short-walk? 100) "should be" true
(short-walk? 110) "should be" false