usr/src/games/trek/ranf.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)ranf.c      5.3 (Berkeley) 6/18/88";
#endif /* not lint */

# include       <stdio.h>

ranf(max)
int     max;
{
        register int    t;

        if (max <= 0)
                return (0);
        t = rand() >> 5;
        return (t % max);
}


double franf()
{
        double          t;
        t = rand() & 077777;
        return (t / 32767.0);
}