CODEWITHSUNDEEP
schemeracket
user1815262
user1815262

Reputation: 1

Racket -UpperCase

; defining the procedure char_toupper to convert a lower case character to upper case
(define char_toupper (lambda (myChar)
                       ; defining x as the ASCII value of myChar
                       (define x (char->integer myChar))
                       ; defining y as x-32
                       (define y (- x 32))
                       ; if statement for while x is less than 91 (already uppercase)
                       (if (< x 91)
                            ; if it is already uppercase, just display it
                            (display myChar)
                            ; otherwise, if x is greater than 96 (lowercase)
                            (if (> x 96)
                                ; then display the character equivalent to the ASCII value given by y
                                (display (integer->char y))))))

(define string_toupper (lambda (myString newString i)       
                         (if (< i (string-length myString))
                             (string_toupper myString (string-append newString (char_toupper (string-ref myString i))) (+ 1 i)))

                         (display newString)))
(string_toupper (read) "" 0)

This converts each character to upper case, and displays it. But I keep getting an error and I can find it. Any help. Thanks

Upvotes: 0

Views: 3244

Answers (1)

soegaard
soegaard

Reputation: 31147

In Racket you must write when instead of if in the one-armed case.

That is, change the if in the following expression to when.

(if (> x 96)
    ; then display the character equivalent to the ASCII value given by y
    (display (integer->char y)))

Also note that string-upcase is builtin.

Upvotes: 2

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