Re: TAC AIR

From: poirier@dg-rtp.dg.com (Charles Poirier)

Date: Tue, 30 Jan 1990 18:44:08 +0000

In article <26241@cup.portal.com> Eric_S_Klien@cup.portal.com writes:
>SUBJECTS: e-mail die-rolling, TAC AIR pbm
>
>I have been thinking of a quick way to get dice rolls when playing
>games by e-mail. Whenever you send a message (your moves) then the
>system will include the time the message was sent, down to 1/100th
>of a second. (or a 1/50th (1/60th) second on a PC ).
>This value divided by 2 (to make PC's enable odd numbers), and rounded
>down will give a value in the range [0;49].
>LABEL:
>To get a roll of a die you could then add 3 (to ensure no zero value),
>square the number (multiply by itself) and keep only the last 2 digits.
>This value is then a percent value in the range [0;99] and this can be
>used to simulate a die-roll.

And here is how that would work:

#include <stdio.h>
main()
{
short bin[100], i, j;
    for (i=2; i<52; i++)
    {
	++bin[(i*i)%100];
    }
    for (j=0; j<10; j++)
    {
	for (i=0; i<10; i++)
	    printf("%d  ", bin[i + 10*j]);
	putchar('\n');
    }
}

Output is:

5  2  0  0  2  0  0  0  0  2
0  0  0  0  0  0  2  0  0  0
0  2  0  0  2  5  0  0  0  2
0  0  0  0  0  0  2  0  0  0
0  2  0  0  2  0  0  0  0  2
0  0  0  0  0  0  2  0  0  0
0  2  0  0  2  0  0  0  0  2
0  0  0  0  0  0  2  0  0  0
0  2  0  0  2  0  0  0  0  2
0  0  0  0  0  0  2  0  0  0

Not a pretty sight for a random number generator.  Nice try, but, sorry.

Cheers,
	Charles Poirier

References

TAC AIR
Eric_S_Klien@cup.portal.com
Wed, 24 Jan 1990 03:17:05 +0000