ctype(3C)                                               ctype(3C)



     NAME
          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, similar to
                            isprint except false for space.

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

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




     Page 1                                        (last mod. 1/14/87)

     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.

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

















































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