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```use strict;
use Math::Trig qw(deg2rad pi great_circle_distance asin acos);

############################
## Distances are in Miles ##
############################

my (\$lat1, \$long1);
my (\$lat2, \$long2);

print "Haversine   : ". &Haversine(\$lat1, \$long1, \$lat2, \$long2) ."\n"
+;
print "Law Cosines : ". &LawCosines(\$lat1, \$long1, \$lat2, \$long2)."\n"
+;
print "Flat-Earth  : ". &FlatEarth(\$lat1, \$long1, \$lat2, \$long2) ."\n"
+;
print "Great Circle: ". &GreatCircle(\$lat1, \$long1, \$lat2, \$long2)."\n
+";

sub LawCosines {
my (\$lat1, \$long1, \$lat2, \$long2) = @_;
my \$r=3956;

* \$r;
return \$dist;

}

sub FlatEarth {
my (\$lat1, \$long1, \$lat2, \$long2) = @_;
my \$r=3956;

my \$c = sqrt(\$a**2 + \$b**2 - 2 * \$a *\$b
my \$dist = \$c * \$r;

return \$dist;

}

sub Haversine {
my (\$lat1, \$long1, \$lat2, \$long2) = @_;
my \$r=3956;

* sin(\$dlong/2)**2;
\$c = 2 * (asin(sqrt(\$a)));
\$dist = \$r * \$c;

return \$dist;

}

sub GreatCircle {
my (\$lat1, \$long1, \$lat2, \$long2) = @_;
my \$r=3956;
my \$dist = great_circle_distance(@zip1, @zip2,\$r);

return \$dist;

}

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