P3
A (much too) simple scheme for pluralizing words in English is to add an
s at the end unless the word already ends in s.
Design a function that consumes a string, and adds s to the end unless
the string already ends in s.
;; String -> String
;; Adds an s to end of given word, unless word already ends in s
(check-expect (pluralize "hello") "hellos")
(check-expect (pluralize "has") "has")
(check-expect (pluralize "") "")
m
er as
;(define (pluralize str) "") ;stub
co
eH w
;(define (pluralize str)
o.
; (... str)) ;template
rs e
ou urc
(define (pluralize str)
(if (string=? str "")
""
o
(if (string=? "s" (string-ith str (- (string-length str) 1)))
aC s
str
vi y re
(string-append str "s"))))
P4
Design a function called nth-char-equal? that consumes two strings
ed d
and a natural and produces true if the strings both have length greater
ar stu
than n and have the same character at position n.
Note, the signature for such a function is:
;; String String Natural -> Boolean
is
The template for such a function is:
Th
(define (nth-char-equal? s1 s2 n)
(... s1 s2 n))
sh
;; String String Natural -> Boolean
;; Produces true if string-length of s1 and s2 are greater than n and have the same character at position
n
(check-expect (nth-char-equal? "hello" "goodbye" 10) false)
(check-expect (nth-char-equal? "hello" "bell" 6) false)
(check-expect (nth-char-equal? "time" "bath" 3) false)
(check-expect (nth-char-equal? "candy" "mandy" 3) true)
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