CTYPE(3C)                                               CTYPE(3C)



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

     SYNOPSIS
          #include <ctype.h>

          int isalpha (c)
          int c;

          . . .

     DESCRIPTION
          These macros classify character-coded integer values by
          table lookup.  Each is a predicate returning nonzero for
          true, zero for false.  Isascii is defined on all integer
          values; the rest are defined only where isascii is true and
          on the single non-ASCII value EOF [-1; 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 [0-9].

          isxdigit       c is a hexadecimal digit [0-9], [A-F] or [a-
                         f].

          isalnum        c is an alphanumeric (letter or digit).

          isspace        c is a space, tab, carriage return, newline,
                         vertical tab, or form-feed.

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

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

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

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

          isascii        c is an ASCII character, code less than 0200.

     SEE ALSO
          stdio(3S), ascii(5).



     Page 1                                        (last mod. 8/20/87)

     CTYPE(3C)                                               CTYPE(3C)



     DIAGNOSTICS
          If the argument to any of these macros is not in the domain
          of the function, the result is undefined.

     ORIGIN
          AT&T V.3

















































     Page 2                                        (last mod. 8/20/87)