On 12-May-02, Ed Dana wrote:
> In an effort to understand this new (and very interesting) language,
> I decided to try something simple; I created a simple guessing game
> where the computer picks a number between 1 and 100.
> Simply yes? Yea, right! :)
> For whatevcr reason: newbie, stupidity, or that my computer just
> plain hates me, I can't get the silly thing to work.
> Here is the script:
> REBOL [
> Title: "Guess a number between 1 and 100"
> Date: 05/11/2002
> Version: 0
> Author: "Ed Dana"
> Purpose: "An excersize in REBOLion."
> Comment: "Just goofing off."
> Category: [game]
> ]
> pick: random/seed 100.0
> guess: ask {What is your guess? }
> while [pick <> guess] [
> if [pick < guess] [ print "To low" ]
> if [pick > guess] [ print "To high" ]
> guess: input
> ]
> print pick
> And the results I get:
>>> do %guess.r
> What is your guess? ** Script Error: trim expected series argument
> of type: series port
> ** Where: ask
> ** Near: trim either hide [input/hide] [input]
> What is it talking about? I haven't a clue.
> I've even tried using Guess: Input and it defines Guess as 1.
> Any advice is appreciated, including types on suicide so that I may
> hide my shame from such a simple newbie mistake. :)
Hi Ed,
A few REBOL specific mistakes there...
pick: random/seed 100.0
'pick shouldn't be used there, as it's a common REBOL word and I think
may have been the cause of your error message. Anyway, changing it
to 'target prevented the error happening for me. ie...
target: random/seed 100.0
(Adding 'protect-system to your user.r script will prevent this kind
of problem by not allowing you to over-write the default REBOL
words.)
Another problem is with the 'ifs...
if [target < guess] [ print "To low" ]
The "target < guess" shouldn't be in a block there, as 'if doesn't
evaluate the block like 'while does. So, this is the correct syntax
for 'if...
if target < guess [ print "To low" ]
but it still won't work in your case as you're comparing a number
(target) with a string (guess). So, to fix that use...
if target < to-integer guess [ print "To low" ]
Which should almost get your script working for you. (I say almost as
I'm leaving what you really should be ashamed of for you to find out
for yourself;)
HTH.
--
Carl Read
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