ISUPPER
if (ISALPHA(c) && ISUPPER(c))
if (!ISDIGIT(t[0]) && !ISUPPER(t[0]))
} else if (ISUPPER(c)) {
if (ISUPPER(ns)) {
if (ISUPPER(ch)) {
(ISUPPER(_c) || \
return (ISUPPER(c));