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ctype(3C)							     ctype(3C)

       ctype:	isalnum(),   isalpha(),	  isascii(),   isblank(),   iscntrl(),
       isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isup‐
       per(), isxdigit() - classify characters according to type

       These  functions	 classify  character-coded integer values according to
       the rules of the coded character set identified by the last  successful
       call  to	 (see  setlocale(3C)).	Each function is a predicate returning
       nonzero for true, zero for false.

       If has not been called successfully, characters are classified  accord‐
       ing  to	the  rules of the default ASCII 7-bit coded character set (see

       is defined on all integer values; the other functions are  defined  for
       the range (EOF) through

       The  functions  return  nonzero under the following circumstances; zero

	      c			  is an alphanumeric (letters or digits).

	      c			  is a letter.

	      c			  is any ASCII character code  between	0  and
				  0177, inclusive.

	      c			  is  a blank character; that is, a space or a

	      c			  is a control character (in ASCII:  character
				  codes less than 040 and the delete character

	      c			  is a decimal	digit  (in  ASCII:  characters

	      c			  is  a	 visible character (in ASCII: printing
				  characters, excluding	 the  space  character

	      c			  is a lowercase letter.

	      c			  is a printing character.

	      c			  is  a	 punctuation  character (in ASCII: any
				  printing character except the space  charac‐
				  ter (040), digits, letters).

	      c			  is  a	 character  that creates whitespace in
				  displayed text (in ASCII: space,  tab,  car‐
				  riage	 return,  newline,  vertical  tab, and

	      c			  is an uppercase letter.

	      c			  is a hexadecimal digit (in ASCII: characters
				  [0-9], [A-F] or [a-f]).

       If  the argument to any of these functions is outside the domain of the
       function, the result is undefined.

   Environment Variables
       The category determines the classification of character type.

   International Code Set Support
       Single-byte character code sets are supported.

       These functions are supplied both as library functions  and  as	macros
       defined	in  the	 header.   Normally,  the macro versions are used.  To
       obtain the library function, either use a to remove the	macro  defini‐
       tion  or,  if  compiling	 in  ANSI-C mode, enclose the function name in
       parenthesis or take  its	 address.   The	 following  example  uses  the
       library functions for and

       was developed by IBM, OSF, and HP.

       setlocale(3C), ascii(5), thread_safety(5).


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