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my $num = 02;
# ...
if ($num eq "02") {print "true\n"} else {print "false\n"};

my $num = 02;
# ...
if ($num == "02") {print "true\n"} else {print "false\n"};

sub check_password {
  my $correct = shift;
  my $password = shift;
  # encrypt password
  if ($password == $correct) {
    return true;
  } else {
    return false;
  }
}

sub check_password {
  my $correct = shift;
  my $password = shift;
  # encrypt password
  if ($password eq $correct) {
    return true;
  } else {
    return false;
  }
}