RE: [Dev-C++] rand()

[Per W. <pw...@ia...>]

I'm not so sure about your definition of time().

time_t is a type - might be int, long, struct xx, ... depending on
implementation and processor register width etc.

However, without checking the latest c++ standard, time() returns time in
seconds since epoch (seconds since 1969).

With a resolution of one second, it is definitely possible to call time()
multiple times and get the same return value.

/Per W

Yes, two calls to time() within the same second will retu

On Thu, 19 Jun 2003, Ioannis Vranos wrote:

> > -----Original Message-----
> > From: dev...@li...
> > [mailto:dev...@li...] On Behalf
> > Of Sudhir K KRISHNAWARRIER
> > Sent: Thursday, June 19, 2003 1:10 AM
> > To: dev...@li...
> > Subject: RE: [Dev-C++] rand()
> >
> > May be it is a little better to use the time in
> > micro/milliseconds in some form as the seed instead of time
> > (NULL) which returns seconds. This will make sure that two
> > instances of the program started almost the same time will
> > not get the same random number sequence. In SVR4/BSD,
> > gettimeofday will do the trick but not sure what is the POSIX
> > way of getting microseconds.
>
>
> time() is not returning seconds it is returning time_t which can be whatever
> the implementation wants. Two subsequent calls of time() cannot return the
> same value since it represents the calendar time (day. month, year, hour,
> minutes, seconds...).
>
>
>
>
>
> Ioannis Vranos
>
> * Programming pages: http://www.noicys.freeurl.com
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