A simple way:
Put all the candidate numbers in a list (in this case, 1 to 40). Then pick
randomly from that array, one at the time, and make sure you remove that
number from the candidates list, so you can't have duplicates.
In code (untested):
function getRandomList():Array {
var min:Number = 1;
var max:Number = 40;
var numItems:Number = 10;
var candidates:Array = [];
// fill up the candidates list with the "eligible" numbers
for(var i:Number = min; i <= max; i++) {
candidates.push(i);
}
var list:Array = [];
var idx:Number = 0;
var selectedNumber:Number = 0;
for(i = 0; i < numItems; i++) {
// get a number from the candidates list, randomly. Add it to the
result and remove it from the candidates list (using splice)
idx = Math.floor(Math.random() * candidates.length);
selectedNumber = candidates.splice(idx,1)[0];
list.push(selectedNumber);
}
return list;
}
Cheers
Juan Pablo Califano
2010/5/5 Alan Neilsen <aneil...@gotafe.vic.edu.au>
> I am working in ActionScript 2. I want to create a quiz in which 10
> questions are randomly selected from a block of 40 questions. I found the
> following code, but I can't work out how to stop it doubling up the
> questions.
>
> function randRange(min:Number, max:Number):Number {
> var randomNum:Number = Math.floor(Math.random() * (max - min + 1)) +
> min;
> return randomNum;
> }
> for (var i = 0; i < 10; i++) {
> var n:Number = randRange(1, 40)
> trace(n);
> }
>
> When I run this it outputs a list of numbers like 40 13 17 12 27 12 3
> 17 9 15 which means some questions (in this case 17 and 12) will appear
> twice in my quiz.
> Bearing in mind that I am a bit of an ActionScript dummy, can anybody
> suggest a way to modify the above script to prevent the same number being
> generated more than once.
>
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