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Re^8: a close prime number

by Limbic~Region (Chancellor)
on Feb 14, 2005 at 17:00 UTC ( #430854=note: print w/ replies, xml ) Need Help??


in reply to Re^7: a close prime number
in thread a close prime number

dragonchild,
I understand the point you were trying to make, but you picked a bad example.
print nearest_power_of_2( 50 ); sub nearest_power_of_2 { my $x = shift; my $n = log( $x ) / log( 2 ); return $x if $n == int $n; my ($below, $above) = (int $n, int $n + 1); $_ = 2 ** $_ for ($above, $below); return $above - $x > $x - $below ? $below : $above; }

Cheers - L~R

Thanks to blokhead for reminding me how to convert logarithmic bases

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