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Re^7: rand() function on Windows systems (pure Perl)

by bakiperl (Beadle)
on Dec 31, 2016 at 16:10 UTC ( [id://1178741]=note: print w/replies, xml ) Need Help??


in reply to Re^6: rand() function on Windows systems (pure Perl)
in thread rand() function on Windows systems

One more thing.

Apparently, the random number seed sub is not necessary the srand operator works the same between the old and the new versions. The simplified code below is enough.

my $seed = srand( 555 ); print ppRand( ), "\n"; sub ppRand { my $max = shift || 1; $seed = ( $seed * 214013 + 2531011 ); return ( ( $seed >> 16 ) & 32767 ) / 32768 * $max; }

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Re^8: rand() function on Windows systems (pure Perl)
by BrowserUk (Patriarch) on Dec 31, 2016 at 22:55 UTC

    You might just as well do:

    my $seed = 555; ...

    It amounts to the same thing.


    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority". The enemy of (IT) success is complexity.
    In the absence of evidence, opinion is indistinguishable from prejudice.
Re^8: rand() function on Windows systems (pure Perl)
by BrowserUk (Patriarch) on Dec 31, 2016 at 20:18 UTC

    Hm. srand always returns 1 regardless of its argument on my system:

    print srand( $_ ) for 1 .. 10;; 1 1 1 1 1 1 1 1 1 1

    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority". The enemy of (IT) success is complexity.
    In the absence of evidence, opinion is indistinguishable from prejudice.

      That's strange. I get the same result on my systems using old and new versions of Perl.

      print srand( $_ )."\n" for 1 .. 10;; 1 2 3 4 5 6 7 8 9 10

        From the pod:

        starting with Perl 5.14, it returns the seed.
        . My default perl is still 5.10.1.

        With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
        Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
        "Science is about questioning the status quo. Questioning authority". The enemy of (IT) success is complexity.
        In the absence of evidence, opinion is indistinguishable from prejudice.

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