#!perl
use warnings;
use strict;
my %arith;
$arith{"+"} = sub { $_[0] + $_[1] };
$arith{"-"} = sub { $_[0] - $_[1] };
$arith{"*"} = sub { $_[0] * $_[1] };
$arith{"/"} = sub { $_[0] / $_[1] };
my $Problem = "6 * 8";
$Problem =~ /^(\d*)\s(.)\s(\d*)$/;
my $Number1 = $1;
my $Number2 = $3;
my $Operator = $2;
my $Op = $arith{$2} or die qq[wrong operator: "$Operator"];
my $Answer;
$Answer = &$Op($Number1, $Number2);
print $Answer, "\n";
__END__
And take care with division by zero errors.
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