my %STUDQT;
$STUDQT{11} =  [qw/fname mname/];
$STUDQT{11}[1][2] =  0;
#$STUDQT{12} =  [qw/fname mname/];
$STUDQT{12}[1][2] =  0;

print
	qq|\$STUDQT{11}[1][2] = $STUDQT{11}[1][2]\n|,
	qq|\t\$STUDQT{12}[1][2] = $STUDQT{12}[1][2]\n|;
$STUDQT{11}[1][2] = 'hello'; #Problem
print
	qq|\$STUDQT{11}[1][2] = $STUDQT{11}[1][2]\n|,
	qq|\t\$STUDQT{12}[1][2] = $STUDQT{12}[1][2]\n|;

__END__

##</code><code>##

$STUDQT{11}[1][2] = 0
	$STUDQT{12}[1][2] = 0
$STUDQT{11}[1][2] = hello
	$STUDQT{12}[1][2] = 0

##</code><code>##

$STUDQT{11}[1][2] = 0
	$STUDQT{12}[1][2] = 0
$STUDQT{11}[1][2] = hello
	$STUDQT{12}[1][2] = hello