NAME
	  isalpha, isupper, islower, isdigit, isxdigit,	isalnum,
	  isspace, ispunct, isprint, isgraph, iscntrl, isascii -
	  classify characters
SYNTAX
	  #include <ctype.h>
	  int isalpha (c)
	  int c;
	  . . .
DESCRIPTION
	  These	macros classify	character-coded	integer	values by
	  table	lookup.	 Each is a predicate returning nonzero for
	  true,	zero for false.	 Isascii is defined on all integer
	  values; the rest are defined only where isascii is true and
	  on the single	non-ASCII value	EOF [-1	- see stdio(3S)].
	  isalpha	 c is a	letter.
	  isupper	 c is an upper-case letter.
	  islower	 c is a	lower-case letter.
	  isdigit	 c is a	digit [0-9].
	  isxdigit	 c is a	hexadecimal digit [0-9], [A-F] or [a-
			 f].
	  isalnum	 c is an alphanumeric (letter or digit).
	  isspace	 c is a	space, tab, carriage return, new-line,
			 vertical tab, or form-feed.
	  ispunct	 c is a	punctuation character (neither control
			 nor alphanumeric).
	  isprint	 c is a	printing character, code 040 (space)
			 through 0176 (tilde).
	  isgraph	 c is a	printing character, like isprint
			 except	false for space.
	  iscntrl	 c is a	delete character (0177)	or an ordinary
			 control character (less than 040).
	  isascii	 c is an ASCII character, code less than 0200.
DIAGNOSTICS
	  If the argument to any of these macros is not	in the domain
				  
	  of the function, the result is undefined.
SEE ALSO
	  stdio(3S), ascii(5).