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Old discussion, but I figure I'll throw in my attempt at calculating primes without modules, and using only recursive functions (no loops)
#!/usr/bin/env perl use strict; use warnings; use 5.010; $DB::deep = 500; $DB::deep = $DB::deep; # Avoids silly 'used only once' warning no warnings "recursion"; # Identify primes between ARG0 and ARG1 my ($x, $y, $re_int, $result); my ($prime, $is_int); $x = $ARGV[0]; $y = $ARGV[1]; $is_int = sub { my $re_int = qr(^-?\d+\z); my ($x) = @_; $x =~ $re_int ? 1 : 0; }; $prime = sub { my ( $x, $y ) = @_; if ( $y > 1 ) { given ($x) { when ( $is_int->( $x / $y ) ) { return 0; } default { return $prime->( $x, $y - 1 ); } } } else { return 1; } }; $result = sub { my ( $x, $y ) = @_; if ( $x <= $y ) { if ( $prime->($x, $x-1) ) { say $x; } $result->( ( $x + 1 ), $y ); } }; $result->($x, $y);
Originally posted the above to my blog.

In reply to Re: Prime Number Finder by jbl_bomin
in thread Prime Number Finder by munchie

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