# [racket] Newbie question

 From: Luke Jordan (luke.jordan at gmail.com) Date: Wed Nov 10 15:53:16 EST 2010 Previous message: [racket] howto-like text about writing DSLs? Next message: [racket] Newbie question Messages sorted by: [date] [thread] [subject] [author]

```Think of how, with multiplication, you could convert a sequence of digits
into a whole number that you could compare to another whole number.

On Nov 10, 2010 2:40 PM, "André Toscano" <andretoscanocarmo at gmail.com>
wrote:

Hi all!

I'm new to programming. I'm trying to learn on my own in my spare time, not
a student in any school or course. Got hold of the HTDP book website when
searching the web for resources, and am progressing through it at my own
(usually slow) pace.

I'm kind of getting stuck on a specific exercise.

It's 5.1.3. in this url
http://htdp.org/2003-09-26/Book/curriculum-Z-H-8.html

I did 5.1.2. already and it's working fine. Also, I have a pretty good idea
of how to do 5.1.4. I'm just stuck at 5.1.3.

As it says in the problem formulation, "check-guess3 consumes three digits
and a number.[...] The number is called 'target'[...]", and from what I can
figure out, 'guess' is a number made up of the three digits that have to be
inputed. So I believe 'target' is the random name that the computer will
choose (like in exercise 5.1.2.) and to which 'guess' should be compared
against.

And that's where I'm stuck. How can I "build" a number based on three
inputed digits?

Should those 3 digits be three different arguments present in the function
definition?

; for example (define (check-guess3 digit1 digit2 digit3 target) ?

I'm not expecting to get a direct answer in here. But if someone could be
kind enough to just rephrase what's expected, that would probably be of
help.

Thanks.

Andre'
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