while (<FILE1>)
        {    $hline=<FILE1>;
                push (@hlines,$hline);
        }

##</code><code>##

@hlines = <FILE1>;

##</code><code>##

my $FILE1;

##</code><code>##

open (FILE1, "$f1") or die "Argh! File not opened! $!";

##</code><code>##

open (FILE1, "<", $f1) or die "Argh! File not opened! $!";

##</code><code>##

#!/root/bin/perl
use strict;
use warnings;

sub square;
sub read_filename;
sub dist;

my $FILE;

my $f1 = read_filename;
open ($FILE, "<", $f1) or die "Argh! File not opened! $!";
my @hlines = <$FILE>;
close $FILE;

my $f2 = read_filename;
open ($FILE, "<", $f2) or die "Argh! Second file not opened! $!";
my @plines = <$FILE>;
close $FILE;

print @hlines;
print @plines;
    
dist;
exit;

sub dist
{
    my $i=0;
    my ($r, $r2);

    foreach my $hline (@hlines)
    {
        my $xh = substr $hline,31,8;
        my $yh = substr $hline,40,8;
        my $zh = substr $hline,48,8;
        foreach my $pline (@plines)
        {
            print '"',$pline,'": len=',length($pline),"\n";
            my $x1 = substr $pline,31,8;
            my $y1 = substr $pline,40,8;
            my $z1 = substr $pline,48,8;
                                    
            $i++;
            $r2=((square($xh-$x1))+(square($yh-$y1))+(square($zh-$z1)));
            $r=sqrt($r2);
            print "$i. $r2 and square root is $r\n";
            if(($r<=2.4)&&($r>=3.6))
                { print "match!"}
        }
    }
    print $i;
    return 1;
}

sub square
{
my $num = shift;
my $sq = $num * $num;
return $sq;
}

sub read_filename
{
print "Enter file name: ";
my $fn = <STDIN>;
chomp $fn;
return $fn;
}