[plt-scheme] Beginner question

On Sep 29, 2005, at 9:15 AM, Anders Persson wrote:

> Hi!
>
> I am trying to learn PLT and yesterday i try to write
> a program with 2 functions that asks for user namen
> och write Hello + user namen
>
> The code was
> -------------------------------------------------------------------
> (define ask-user-name
>  (begin
>  (display "Hi whats your name? ")
>  (read-line)))
>
> (define say-hello-to-user
>  (lambda (name)
>    (display "Hello ")
>    (display name)))
>
> (define name (string->symbol ask-user-name))
> (say-hello-to-user name)
> ---------------------------------------------------------------------
>
> My qestion is this a good program or is there
> some changes to make it a more professional look.

Take a look at htdp.org. It may help.

If someone put a gun to my head to write such a program I'd probably do 
it like this:

(define (ask-and-respond)
   (printf "Hi. What's your name? ~n")
   (printf "Hello ~a." (read-line)))

> And som ting that puzzles me is the line
>
> (define name (ask-user-name))

ask-user-name isn't a function.

> don't work but
>
> (define name (string->symbol ask-user-name))


> Works this is a try-and-error and i would like

Yes it is. It is better to learn to program systematically. -- Matthias


> som explanation way i have to konvert my
> string to symbol, becurse i can write
> (define name "Hello Anders")
> but not
> (define name (ask-user-name))
>
> Best regards
> Anders Persson
>
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