Re: DO WHILE
In article <ymi39zypxtp.fsf@blackcat.isi.edu>,
tar@sevak.isi.edu (Thomas A. Russ) wrote:
dendeezen <tsd35328@scarlet.be> writes:
Iis there a better way to write :
int s ;
do {
// blablabla...
}while ( s!=MyArr[0];
s!=MyArr[1]
//etc, etc
);
Well, one way, as noted would be to not use primitive arrays but to use
Collection instead.
Another somewhat clever method would be to do something like this:
final static int N_BALLS = 42;
final static int N_DRAWS = 6;
Random generator = new Random();
Collection<Integer> balls = new HashSet<Integer>(N_BALLS);
Collection<Integer> choices = new ArrayList<Integer>(N_DRAWS);
for (int i = 0; i < N_BALLS; i++) {
balls[i] = i+1;
}
int range = N_BALLS;
for (int j = 0; j < N_DRAWS; j++) {
choices[j] = balls[generator.nextInt(range--)];
balls.remove(choices[j]);
}
// Then you have the random results in choices.
Very appealing; I'm assuming Collection methods rather than array
accesses. Similarly:
private static final int N = 42;
private static final int K = 6;
....
List<Integer> balls = new ArrayList<Integer>(N);
for (int i = 0; i < N; i++) {
balls.add(i + 1);
}
Collections.shuffle(balls, generator);
choices = balls.subList(0, K);
--
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>