# 2.11BSD#431 - /usr/man/cat3/isxdigit.0

    CTYPE(3)	    UNIX Programmer's Manual		 CTYPE(3)

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

    SYNOPSIS
         #include <ctype.h>

         isalpha(c)

         . . .

    DESCRIPTION
         These macros classify ASCII-coded integer values by table
         lookup.  Each is a predicate returning nonzero for true,
         zero for false.  Isascii and toascii are defined on all
         integer values; the rest are defined only where isascii is
         true and on the single non-ASCII value EOF (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

         isxdigit	    c is a hex digit

         isalnum	    c is an alphanumeric character

         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).

         isascii	    c is an ASCII character, code less than 0200

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

         toupper	    c is converted to upper case.  Return value

    Printed 11/26/99	  May 12, 1986				1

    CTYPE(3)	    UNIX Programmer's Manual		 CTYPE(3)

    		    is undefined if not islower(c).

         toascii	    c is converted to be a valid ascii character.

    SEE ALSO
         ascii(7)

    Printed 11/26/99	  May 12, 1986				2

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