Hi all, just registered for this.
As a novice Pascal programmer I would like to generate a unique code within Pascal and put it into an array. The code has to exist out of 4 unique numbers ranging from 0 to 9.
It's easy to generate 4 numbers from 0 to 9 with the Random function but the problem is that a number can only be used once. So for example this would be good:
0 5 9 4
This would be wrong:
0 5 0 5
At first I was thinking along the lines of repeating the Random function until it no longer matches another number. That's very easy for the first two:
[code]a := Random(9)
b := Random(9);
UNTIL b <> a;[/code]
But this won't work for c: I can check to see if c is the same as a and if it is then Randomize again, after randomizing it it hopefully is no longer the same as a but then it's the same as b. Randomizing again might make it the same as a again.
c := Random(9);
UNTIL c <> a AND c <> b;[/code]
But that gives me type mismatch. It *could* be possible with nested If's but that would look like a mess.
Anyone have an idea for a simple solution to this?