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I rearranged it a bit so you can just plug in your factor list and it will figure out what your number is. Note that in this case, the closest value is 5*7, but it returns 3*19.
use strict; use warnings; use List::Util qw[ reduce ]; my @pfs = ( 3,5,7,19 ); my $num = reduce { $a * $b } @pfs; my $root = sqrt $num; print "N=$num, R=$root\n"; #the rest is the same as you had it
Here's a fix:
use strict; use warnings; use List::Util qw[ reduce ]; my @pfs = ( 3,5,7,19 ); my $num = reduce { $a * $b } @pfs; my $root = sqrt $num; print "N=$num, R=$root\n"; my $near = reduce{ abs($root - $a * $b) < abs($root - $a) ? $a*$b : $a } reverse @pfs; print abs($root - $near) > abs($root - ($num/$near)) ? $num/$near : $near ;

Caution: Contents may have been coded under pressure.

In reply to Re^2: OT: Finding Factor Closest To Square Root by Roy Johnson
in thread OT: Finding Factor Closest To Square Root by QM

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