Something

#!/usr/bin/perl
print "\nDo you want to use add or minus: ";
$lawl = <STDIN>;
chomp $lawl;

print "Enter your first number: ";
$num1 = <STDIN>;
chomp $num1;

print "Enter you second number: ";
$num2 = <STDIN>;
chomp $num2;

if ($lawl eq 'add') {
   print "$num1" + "$num2";
   print "\n\n";
  } elsif ($lawl eq 'minus') {
     print "$num1" - "$num2";
     print "\n\n";
     }