sub diag {
my $x = shift @_;
my $y = shift @_;

my $x_sq = $x * $x;
my $y_sq = $y * $y;
my $prod = $x_sq * $y_sq;
my $result = sqrt($prod);
return $result;
}

##</code><code>##

sub diag {
my $x = shift @_;
my $y = shift @_;
return abs ($x * $y);
}

##</code><code>##

sub diag {
return abs ($_[0] * $_[1]);
}