Re^5: rand() function on Windows systems (pure Perl)

Small correction in the code above:

This line of code :

return ( ( $seed >> 16 ) & 32767 ) / 32767 * $max;
[download]

should be:

return ( ( $seed >> 16 ) & 32767 ) / 32768 * $max;
[download]

The difference can be seen if you don't use the integer (int) function.

Comment on Re^5: rand() function on Windows systems (pure Perl) Select or Download Code

Replies are listed 'Best First'.
Re^6: rand() function on Windows systems (pure Perl) by BrowserUk (Patriarch) on Dec 31, 2016 at 03:10 UTC
The difference can be seen if you don't use the integer (int) function. You are absolutely correct++! 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.	[reply]
Re^7: rand() function on Windows systems (pure Perl) by bakiperl (Beadle) on Dec 31, 2016 at 16:10 UTC
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; }` [download]	[reply] [d/l]
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; ...` [download] 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.	[reply] [d/l]
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` [download] 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.	[reply] [d/l]
Re^9: rand() function on Windows systems (pure Perl) by bakiperl (Beadle) on Dec 31, 2016 at 20:36 UTC
Re^10: rand() function on Windows systems (pure Perl) by BrowserUk (Patriarch) on Dec 31, 2016 at 21:44 UTC


Clear questions and runnable code get the best and fastest answer
	PerlMonks