[gameprogrammer] Re: Random Integer Problem :(

in my first game-try (sth like minesweeper of windows) i used
glutGet(GLUT_ELAPSED_TIME);
and used the returning value for the random func and i seem to remember i
used the random func 2 times for 1 mine..
the result :: it really worked and seems like real random:P numbers...not
1-4-3-1-4-3 or sth like that


2006/9/24, Andrew Falgout <andrew.falgout@xxxxxxxxx>: 

Perhaps you can explain why the modulus would be the improper way of
getting a random number?

On 9/24/06, Olivier Delannoy < olivier.delannoy@xxxxxxxxx> wrote:
>
>        In  Numerical Recipes in C: The Art of Scientific Computing
> (William H.
>        Press, Brian P. Flannery, Saul A. Teukolsky, William T.
> Vetterling; New
>        York:  Cambridge University Press, 1992 (2nd ed., p. 277)), the
> follow-
>        ing comments are made:
>
>               "If you want to generate a random integer between 1 and
> 10,  you
>               should always do it by using high-order bits, as in
>
>                      j = 1 + (int) (10.0 * (rand() / (RAND_MAX + 1.0)));
>
>               and never by anything resembling
>
>                      j = 1 + (rand() % 10);
>
>
> from unix man page of rand
> $> man 3 rand
>
> On 9/24/06, Chris Nystrom <cnystrom@xxxxxxxxx> wrote:
> >
> >
> > On 9/23/06, Sahan Chandrasekara < sahanthegamecreator@xxxxxxxxx>
> wrote:
> > > Hi,
> > >
> > > I'm trying to use this code to generate a random number between 1
> and six
> > inclusive:
> > >
> > >
> > > int random_int() {
> > >     srand(time(NULL));
> > >     int random_num=rand()%7;
> > >     return random_num;
> > > }
> > >
> > > But it dosen't work. My program is programmed to quit immediantly if
> the
> > number is not between 1 and six inclusive, and that is what it does
> >
> > I believe for 1-6 you want something like:
> >
> > random_num = ((rand() % 6) + 1);
> >
> > Chris
> >
> > --
> > E-Mail: Chris Nystrom <cnystrom@xxxxxxxxx >
> > http://www.newio.org/
> > AIM: nystromchris
>
>
> ---------------------
> To unsubscribe go to http://gameprogrammer.com/mailinglist.html
>
>
>


--
./Andrew





--
Just say the words , your wish is my command..

Other related posts: