Re: Random Number in PRG: example

[Jim Langston <jimlangston@xxxxxxxxxxxxxxxx>]

After you run this program, take the last random number generated and stick
it somewhere.  A dataqueue, a file somewhere, wherever.  When you run this 
program again, read the last random number and use it for the seed.

Regards,

Jim Langston

Me transmitte sursum, Caledoni!

"DeLong, Eric" wrote:
> 
> True, I added the time seed shortly after posting the example, and I too
> realized that Hans' example was repeating sequences.  It also occurs to me
> that seeding by TIME (6.0) could be a bad idea is the program runs at the
> same time every night (scheduled job). It's not hard to imagine the same
> seed value being used repeatedly...... perhaps something more random like
> milliseconds....
> 
> Eric DeLong
> 
> -----Original Message-----
> From: Paul Cunnane [mailto:paul@cunnane.net]
> Sent: Wednesday, April 25, 2001 7:57 AM
> To: RPG400-L@midrange.com
> Subject: Re: Random Number in PRG: example
> 
> Caveat: every time you run this, you will get the same sequence of `random'
> numbers.  To get more truly pseudo-random numbers, seed the generator with
> (say) the result of the TIME opcode.
> 
> I also tried this code without seeding the generator (commented out the
> callp srand line), and got different, random-looking number sequences.
> Maybe this is the best approach?
> 
> --
> Paul
> 
> ----- Original Message -----
> From: "DeLong, Eric" <EDeLong@Sallybeauty.com>
> To: <RPG400-L@midrange.com>
> Sent: Tuesday, April 24, 2001 9:01 PM
> Subject: RE: Random Number in PRG: example
> 
> > Ugh! That might work ok, but it's a bit dated..... If you're using RPGIV,
> > give this a spin.
> >
> > ---------------------------------------------------------------
> > H dftactgrp(*no) bnddir('QC2LE')
> > D rand            pr            10i 0 extproc('rand')
> > D srand           pr                  extproc('srand')
> > D                               10i 0 value
> > D num             s             10i 0
> > D i               s             10i 0
> > C                   callp     srand(123)
> > C                   for       i = 1 to 10
> > C                   eval      num = rand
> > C     num           dsply
> > C                   endfor
> > C                   eval      *inlr = *on
> > ----------------------------------------------------------------
> >
> >
> > This was right out of the archives (thanks Hans). SRAND seeds the random
> > generator, and RAND returns the random numbers. MUCH  simpler than the
> > RPGIII code you found.
> >
> > hth,
> > Eric DeLong
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