2.11BSD#431 - /usr/man/cat3/isdigit.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