;;;; This example illustrates the use of the design recipe for
;;;; functions consuming simple (atomic) data.  Steps 1 and 4
;;;; aren't involved in this simple situation.

;; (Step 2) Contract/purpose/header
;; f2c : Number -> Number
;; converts temperature in degrees Fahrenheit to degrees Celsius
;; (define (f2c f) ... )

;; (Step 5) Body
(define (f2c f)
  (* 5/9 (- f 32)))

;; (Step 3) Examples and (Step 6) Tests
(f2c 212) "should be" 100
(f2c 32) "should be" 0

;; After the above function has been developed, we can use the
;; convert.ss teachpack (by selecting the Add Teachpack option
;; from DrScheme's Language menu) and connect it to a GUI
;; as follows:
(convert-gui f2c)