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CTYPE(3P)							     CTYPE(3P)

NAME
       isalpha,	  isupper,   islower,  isdigit,	 isxdigit,  isalnum,  isspace,
       ispunct,	 isprint,  isgraph,  iscntrl,  toupper,	 tolower  -  character
       classification macros

SYNOPSIS
       #include <ctype.h>

       isalpha(int c);

       . . .

DESCRIPTION
       These  interfaces  classify  C  locale  integer values by table lookup.
       Each is a predicate returning nonzero for true, zero for false.

       isalpha	      c is a letter

       isupper	      c is an upper case letter

       islower	      c is a lower case letter

       isdigit	      c is a digit

       isxdigit	      c is a hex digit

       isalnum	      c is any character for which isalpha or isdigit is true.

       isspace	      c is a space, tab, carriage  return,  newline,  vertical
		      tab, or formfeed

       ispunct	      c	 is  a	punctuation  character	(neither  control  nor
		      alphanumeric)

       isprint	      c is a printing character, code 040(8)  (space)  through
		      0176 (tilde)

       isgraph	      c	 is  a	printing  character, similar to isprint except
		      false for space.

       iscntrl	      c is a  delete  character	 (0177)	 or  ordinary  control
		      character (less than 040).

       tolower	      c is converted to lower case.  Return value is undefined
		      if not isupper(c).

       toupper	      c is converted to upper case.  Return value is undefined
		      if not islower(c).

NOTE
       These interfaces are provided in the form of macros and functions.

       If  you're  using  NEXTSTEP font encoding, then you shouldn't use these
       interfaces; use the NXCType functions instead.  NXCType is discussed in
       the  online  NEXTSTEP  documentation  (accessible  through  the Digital
       Librarian).  These macros are provided to support ANSI-C.

SEE ALSO
       ascii(7), online NEXTSTEP documentation for NXCType

7th Edition			August 1, 1992			     CTYPE(3P)
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