On Wed, Dec 07, 2005 at 12:41:39AM +0900, Christian Neukirchen wrote:
> Mauricio FernáÏdez <mfp / acm.org> writes:
> 
> > When called with no arguments, rand will use
> >
> > static double
> > genrand_real(void)
> > { 
> >     unsigned long a=genrand_int32()>>5, b=genrand_int32()>>6; 
> >     return(a*67108864.0+b)*(1.0/9007199254740992.0); 
> > }
> >
> > so it would seem that two consecutive calls to rand() cannot return the
> > same value, but I still have to think about the effect of qsort.
> 
> And that is a good thing?  How can the sequence be "random" if it
> never contains the same two numbers in row?  (Remember Enigma...)

Nah, I misread genrand_real; the above shows it is possible.

-- 
Mauricio Fernandez