The digit to word conversion is a trivial hash lookup so that doesn't need a sub, but the input prompt and checking is complicated so that is worth writing a sub for. Consider:

use strict;
use warnings;

my %toWord = (
    "1" => "one",
    "2" => "two",
    "3" => "three",
    "4" => "four",
    "5" => "five",
    "6" => "six",
    "7" => "seven",
    "8" => "eight",
    "9" => "nine"
    );

print <<MSG;
This program will ask you to type in two numbers and then add those nu
+mbers together.
It will then display the problem and the answer in word form.
MSG

while (1) {
    my $user1 = getDigit(4, ' or type done to exit') or next;
    last if $user1 eq "done";

    my $user2 = getDigit(5) or next;
    my $sum = ($toWord{$user1 + $user2});

    $user1 = (ucfirst $toWord{$user1});
    print "$user1 plus $toWord{$user2} equals $sum\n";
}


sub getDigit {
    my ($last, $extra) = @_;

    $extra .= ': ';
    print "Enter and integer between one and $toWord{$last}$extra";
    chomp(my $value = <STDIN>);

    if ($value !~ /^([1-9]|done)$/) {
        print "I don't understand '$value'\n";
        return;
    }

    return $value if $value =~ /^done$/ || $value <= $last;

    print "$toWord{$value} is not in the range one to $toWord{$last}.\
+n";
    return;
}

[download]

Note that variables are declared where they are first used.

True laziness is hard work

In reply to Re: Subroutine Question by GrandFather
in thread Subroutine Question by Socrates440

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