Random number generator

[ciccio]

Hi,

Maybe slightly off topic here, but what algorithm is used for the
implementation of rand() in <cstdlib> ?

Or if it is not standardized (which it should), does anybody know what
it is in g++?

Thanks

 

[Ian Collins]

Hi,

Maybe slightly off topic here, but what algorithm is used for the
implementation of rand() in <cstdlib> ?

See section 7.20.2.2 of the standard for a portable implementation.

 

[Ian Collins]

See section 7.20.2.2 of the standard for a portable implementation.

The C99 standard that is.

 

[Kai-Uwe Bux]

Hi,

Maybe slightly off topic here, but what algorithm is used for the
implementation of rand() in <cstdlib> ?

Not specified by the standard.

Or if it is not standardized (which it should),

does anybody know what it is in g++?

http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/stdlib/?cvsroot=glibc

You want to look at rand.c and random.c.


Best

Kai-Uwe Bux

 

[James Kanze]

ciccio wrote:

See section 7.20.2.2 of the standard for a portable implementation.

That's the C standard, of course. And it's known to be a very
poor generator.