If you neglect overloading, all values other than "0", "", (), or undef are true. Equality to zero has nothing to do with it. Consider these: 

my @zeroes = qw( zero 0ButTrue 00 ); 

for my $z (@zeroes) {
    print "'$z' ", $z == 0 ? 'is ' : 'is not ', "equal to zero.\n";
    print "'$z' ", $z ? 'is ' : 'is not ', "true.\n\n";
}

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With overloading, it is even possible to get an object which is both not equal to zero and false. 
package C; 
use overload 'bool' => sub { 0 };
use overload '=='   => sub { 0 }; 
sub new { bless {} }

package main; 
my $c = C->new;

print "\$c is not equal to zero.\n" unless $c == 0; 
print "\$c is not true.\n"          unless $c;

[download]

-sauoq
"My two cents aren't worth a dime.";

In reply to Re: Re: Re: using exit and number 1 at end of file by sauoq
in thread using exit and number 1 at end of file by lazypays

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