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ctype(3)							      ctype(3)

NAME
       isalnum, isalpha, isascii, iscntrl, isdigit, isgraph, islower, isprint,
       ispunct, isspace, isupper, isxdigit - Classify characters

SYNOPSIS
       #include <ctype.h>

       int isalnum(
	       int c ); int isalpha(
	       int c ); int isascii(
	       int c ); int iscntrl(
	       int c ); int isdigit(
	       int c ); int isgraph(
	       int c ); int islower(
	       int c ); int isprint(
	       int c ); int ispunct(
	       int c ); int isspace(
	       int c ); int isupper(
	       int c ); int isxdigit(
	       int c );

LIBRARY
       Standard C Library (libc)

STANDARDS
       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       isalnum(),   isalpha(),	isascii(),  iscntrl(),	isdigit(),  isgraph(),
       islower(),  isprint(),  ispunct(),  isspace(),  isupper(),  isxdigit():
       XSH5.0

       Refer  to  the  standards(5)  reference page for more information about
       industry standards and associated tags.

PARAMETERS
       Specifies the character to be tested. In all cases, this	 parameter  is
       an int data type, whose value must be representable as an unsigned char
       or must equal the value of  the	macro  EOF  (defined  in  the  stdio.h
       include	file).	When  this parameter has a value that cannot be repre‐
       sented as an unsigned char or EOF, the result is undefined.

DESCRIPTION
       The ctype functions test for membership in a  character	class  in  the
       current	locale. Each function tests to see if a character is part of a
       different character class.

       If the character is part of the character class, the function returns a
       nonzero	value  for  true; otherwise, the function returns a value of 0
       (zero) for false.

       Each function is named by adding the prefix is to the name of the char‐
       acter  class  for  which the function tests. For example, the isalpha()
       function tests whether the  character  specified	 by  the  c  parameter
       belongs to the alpha class.

       The  following  lists  the  function names and describes the conditions
       under which the functions return a true value.  When c is  a  character
       of  class alpha or class digit in the program's current locale.	When c
       is a character of class alpha in the program's current locale.  Charac‐
       ters  in	 classes  lower and upper automatically belong to class alpha.
       When c is a 7-bit US-ASCII character whose value is in the range	 0  to
       0177  (0	 to 0x7F), inclusive.  When c is a character of class cntrl in
       the program's current locale.  When c is a character of class digit  in
       the  program's current locale. The following characters are included in
       this class:

	      0 1 2 3 4 5 6 7 8 9 When c is a character of class graph in  the
	      program's	 current  locale.  Characters in classes alpha, digit,
	      and punct are automatically in class  graph.  Unlike  isprint(),
	      isgraph()	 returns  FALSE	 for the space character.  When c is a
	      character of class lower in the program's current locale.	 At  a
	      minimum,	the  26	 lowercase US-ASCII characters are included in
	      this class. These are:

	      a b c d e f g h i j k l m n o p q r s t u v w x y z When c is  a
	      character	 of  class  print in the program's current locale. All
	      characters in the class graph and the space character are	 auto‐
	      matically included in the class print.  When c is a character of
	      class punct in the program's current locale.  When c is a	 char‐
	      acter of class space in the program's current locale. At a mini‐
	      mum, the space, form-feed, newline,  carriage-return,  tab,  and
	      vertical-tab characters are included in this class.  When c is a
	      character of class upper in the program's current locale.	 At  a
	      minimum,	the  26	 uppercase US-ASCII characters are included in
	      this class. These are:

	      A B C D E F G H I J K L M N O P Q R S T U V W X Y Z When c is  a
	      character	 of  class xdigit in the program's current locale. The
	      following characters are included in this class:

	      0 1 2 3 4 5 6 7 8 9 A B C D E F a b c d e f

NOTES
       The LC_CTYPE category of the current locale affects all conversions.

       In the C locale, or in a locale where character-type information is not
       defined,	 characters are classified according to the rules of the ASCII
       character set. For any character value greater than octal 177 (0177  in
       C-language context) the value 0 (zero) is returned.

       [Tru64 UNIX]  The isdigit(), isxdigit(), and isalnum() functions do not
       recognize Thai digits. Many applications make assumptions about	how  a
       digit  character	 can  be converted to its numeric equivalent. Changing
       the functions to recognize Thai digits would break these	 applications.
       Refer to TACTIS(5) for more information about Thai digits.

RETURN VALUES
       Upon  successful	 completion of any function, a nonzero (TRUE) value is
       returned. Otherwise, the value 0 (FALSE) is returned.

SEE ALSO
       Files: locale(4)

       Functions: ctype(3), setlocale(3), wctype(3)

       Standards: i18n_intro(5), standards(5)

								      ctype(3)
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