Refactoring your refactoring just a tad…

# Get the input...
print "\nEnter the power (a positive integer from 1 through 9): ";
chomp(my $power = (<STDIN>));

# Quietly end if there's no input...
$power =~ m/\S/ or exit 1;

# Validate the input...
$power =~ m/^[1-9]$/
    or die "$power is not a positive integer from 1 through 9\n";

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In reply to Re^2: Algebraic Expansion of Binomials Using a Recursive Subroutine by Jim
in thread Algebraic Expansion of Binomials Using a Recursive Subroutine by lilgreen

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