Integer roots: Difference between revisions
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→{{header|Perl 6}}: generate initial guess numerically
SqrtNegInf (talk | contribs) m (→{{header|Perl 6}}: generate initial guess numerically) |
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Line 615:
<lang perl6>sub integer_root ( Int $p where * >= 2, Int $n --> Int ) {
my Int $d = $p - 1;
▲ my $guess = '1' ~ ( '0' x ($n.chars / $p) );
my $iterator = { ( $d * $^x + $n div ($^x ** $d) ) div $p };
my $endpoint = { $^x ** $p <= $n
and ($^x + 1) ** $p > $n };
return [min] (+$guess, $iterator ... $endpoint)[*-1, *-2];
}
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