Thanks,
Everything works now like a charm.
Roelof
Op 20-3-2012 1:20, Stephen Bloch schreef:
On Mar 19, 2012, at 3:10 PM, Roelof Wobben wrote:
But the contents of color does not change so I get a error message.
What is the racket way to change the value of a string.
That's not the problem.
On Mar 19, 2012, at 3:10 PM, Roelof Wobben wrote:
> But the contents of color does not change so I get a error message.
> What is the racket way to change the value of a string.
That's not the problem. It's your error message, so you should be able to
figure out why it's happening. It has noth
ps. Your program's light function does NOT map Strings to Images. It maps World
to images, ASSUMING you have defined
;; World is ...
(probably string here but 1, 2, and 3 would work and so would many others).
On Mar 19, 2012, at 4:25 PM, Matthias Felleisen wrote:
>
> 1. Your program doe
1. Your program does NOT change a string. It changes the state of the traffic
light (or it tells drracket to keep track of a different state). The string
"rood" remains the same in eternity.
2. You're missing test cases, and if you had tested the program you would have
discovered it before ev
Hello,
I have to make a traffic-light which changes color after each tick of
the computer.
So I thought this would work :
;; String -> Image
;; given a state of a trafic-light display a circle of the given color
if it's a color of the traffic-light otherwise error
(define (light color)
(c
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