# Program that will add or multiply as many numbers that are entered.
# Use the program as such: program.pl add 3 2 1

use warnings;
use strict;

my $rtn;

my $len = @ARGV;  #Get the number of elements
$len = $len - 1;


if ($ARGV[0] =~ /add/) {
 $rtn = add($ARGV[1]..$ARGV[$len]);
 print "The sum is: $rtn";
}
elsif ($ARGV[0] =~ /multiply/) {
 $rtn = multiply($ARGV[1]..$ARGV[$len]);
 print "The product is $rtn";
}


sub add {
 my $sum = 0;
 my @data = @_;
 for (@data){
  $sum += $_;
 }
 return $sum;
}


sub multiply {
  my $product = 1;
  my @data = @_;
  for (@data) {
   $product *= $_;
  }
  return $product;
}