Simple Data Course section 1b - HtDF example

HtDF_example1.rkt

;; Signature
;; String -> String

;; Purpose
;; adds "!" to the end of s

;; Examples
(check-expect (yell "hello") "hello!") ; elborate - "hello" + "!"
(check-expect (yell "goodbye") "goodbye!") ; elborate - string-append "goodbye" "!"

;; Stub
;;(define (yell s) "")

;; Inventory Template/Constants
;;(define (yell s)(... s))

;; copy the template

;; Code Body
(define (yell s)
  (string-append s "!"))