printf("%s: %d %d\n", ("C" < "CZ")? "true C < CZ" : "false C > CZ", 'C', 'CZ');
printf("%s\n", ("C" lt "CZ")? "true: C lt CZ" : "false b/c C gt CZ");
printf("%s\n", ("D" lt "CZ")? "true: D lt CZ" : "false b/c D gt CZ");
$let = 'C';
printf("%s\n", ++$let );
$let = 'z';
printf("%s\n", ++$let );