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Date: | Sat, 12 Mar 2005 10:26:24 +0100 |
From: | Brian Budge <brian DOT budge AT gmail DOT com> |
Reply-To: | Brian Budge <brian DOT budge AT gmail DOT com> |
To: | Alex Vinokur <alexvn AT users DOT sourceforge DOT net> |
Subject: | Re: g++ & rand() in Cygwin |
Cc: | gcc-help AT gcc DOT gnu DOT org, cygwin AT cygwin DOT com |
In-Reply-To: | <d0u0pt$aj0$1@sea.gmane.org> |
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References: | <d0u0pt$aj0$1 AT sea DOT gmane DOT org> |
Hi Alex - You should seed the rng first before using it. Also, there are much better rngs out there than rand (though it's much better than it used to be). I tend to plug for Mersenne Twister which is both faster, produces better random numbers, and can be used in a parallel programming environment. Brian On Sat, 12 Mar 2005 08:04:59 +0200, Alex Vinokur <alexvn AT users DOT sourceforge DOT net> wrote: > ------ foo.cpp ------ > #include <cstdlib> > #include <iostream> > using namespace std; > int main () > { > cout << rand() << endl; > cout << rand() << endl; > return 0; > } > --------------------- > > // g++ version 3.3.3 (cygwin special) > > $ g++ foo.cpp > > The program below generates the following output: > ----------- > 0 > 1481765933 > ----------- > > First pseuso-random number is 0. > > Is it by purpose? > > -- > Alex Vinokur > email: alex DOT vinokur AT gmail DOT com > http://mathforum.org/library/view/10978.html > http://sourceforge.net/users/alexvn > > -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
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