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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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