Scratch
archived forums
#1 2011-02-16 01:18:29
Rejecting Letters in Questions
Hi all,
I need help with a script whereby a sprite asks a question and the only logical answer is a numerical value. If a letter is entered, how can I reject it?
I've already tried creating a list with all the letters in it to no avail...
<if><( answer <=> letterlist )>
<say[ wrong! ]for( 4 )secs>
Any ideas? 
Luke.
Offline
#2 2011-02-16 04:22:57
- Paddle2See
- Scratch Team
- Registered: 2007-10-27
- Posts: 1000+
Re: Rejecting Letters in Questions
Take a look at the list block "contains"...it will do what you want.
if <letterlist Contains answer >
Say Wrong! for 4 secs
Offline
#3 2011-02-16 20:15:45
Re: Rejecting Letters in Questions
Paddle's method will work great, but here's a little trick for figuring out if something isn't a number:
How it works:
If you multiply a non-number by any number in Scratch, it will give you 0, so if you get 0 by multiplying the answer by 1 and that answer is not 0 itself, then you know the answer must be a non-number.
Offline
#4 2011-02-16 21:00:52
- MoreGamesNow
- Scratcher
- Registered: 2009-10-12
- Posts: 1000+
Re: Rejecting Letters in Questions
Nice method scmb1. Lol, I was going to suggest breaking it apart letter by letter into a list and checking each individual item. Yours is much better time-wise and efficiency-wise.
"Cogito ergo sum" -- I think, therefore I am
Offline
#5 2011-02-17 03:41:51
- scimonster
- Community Moderator
- Registered: 2010-06-13
- Posts: 1000+
Re: Rejecting Letters in Questions
scmb1 wrote:
Paddle's method will work great, but here's a little trick for figuring out if something isn't a number:
http://img155.imageshack.us/img155/8771 … hecker.gif
How it works:
If you multiply a non-number by any number in Scratch, it will give you 0, so if you get 0 by multiplying the answer by 1 and that answer is not 0 itself, then you know the answer must be a non-number.
Was that from my project?
Moderator | Scratch Wiki Administrator | Coders' Shed AdministratorScratch 2.0 is just around the corner! Prepare for the transition by beta testing. Your feedback will help make it the best it can be!
Offline
#6 2011-02-17 04:49:47
- mathematics
- Scratcher
- Registered: 2009-03-01
- Posts: 1000+
Re: Rejecting Letters in Questions
scimonster wrote:
scmb1 wrote:
Paddle's method will work great, but here's a little trick for figuring out if something isn't a number:
http://img155.imageshack.us/img155/8771 … hecker.gif
How it works:
If you multiply a non-number by any number in Scratch, it will give you 0, so if you get 0 by multiplying the answer by 1 and that answer is not 0 itself, then you know the answer must be a non-number.Was that from my project?
I guess not, because I think I've seen a script that's almost (or exactly) the same in a project before. I'm sure that's not your project because I think I have seen that project for a long time...
Offline
#7 2011-02-17 18:53:38
Re: Rejecting Letters in Questions
scimonster wrote:
scmb1 wrote:
Paddle's method will work great, but here's a little trick for figuring out if something isn't a number:
http://img155.imageshack.us/img155/8771 … hecker.gif
How it works:
If you multiply a non-number by any number in Scratch, it will give you 0, so if you get 0 by multiplying the answer by 1 and that answer is not 0 itself, then you know the answer must be a non-number.Was that from my project?
No. Actually, I just thought of it myself. Gee, I thought I was being clever. 
Offline
#8 2011-02-18 09:04:27
- mathematics
- Scratcher
- Registered: 2009-03-01
- Posts: 1000+
Re: Rejecting Letters in Questions
Then who should I give credit to if I want to use this method?
Offline
#9 2011-02-18 17:51:55
Re: Rejecting Letters in Questions
mathematics wrote:
Then who should I give credit to if I want to use this method?
I don't know who should technically get credit, but I don't care if I get credit for that little script, so give it to scimonster.
Offline