Re^2: Resetting variables

Hmm, I believe I am checking to make sure $good_guesses is defined (unless I don't understand what defined() really does):

} elsif ((defined($good_guesses))&&($guess =~ /[$good_guesses]/)) {
        print "\n***You already guessed that letter!*** (hit any key)\
+n"; <>;
    } else {
        if ($word =~ /[$guess]/) {
            if (defined($good_guesses)) {
                $good_guesses .= "$guess" unless ($guess =~ /[$good_gu
+esses]/);
            } else {
                $good_guesses .= "$guess";
            }
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Re^3: Resetting variables by Sandy (Curate) on Dec 21, 2004 at 22:06 UTC
Simply put... `my $var; # variable is undefined if ($var) { ... } # $var is false because it is undefined if (defined $var) {...} # false $var = ""; if ($var) { ... } # false because $var is null string if (defined $var) {...} # true because $var has been # defined as having a null string $var = 0; if ($var) { ... } # false because $var is zero if (defined $var) {...} # true because $var has been # defined as zero` [download]	[reply] [d/l]

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Re^3: Resetting variables
by Sandy (Curate) on Dec 21, 2004 at 22:06 UTC

my $var;     # variable is undefined
if ($var) { ... }  # $var is false because it is undefined
if (defined $var) {...}  # false

$var = "";
if ($var) { ... } # false because $var is null string
if (defined $var) {...} # true because $var has been
                        # defined as having a null string

$var = 0;
if ($var) { ... } # false because $var is zero
if (defined $var) {...} # true because $var has been
                        # defined as zero
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