ctype(3C) — sys5



CTYPE(3C)       DOMAIN/IX Reference Manual (SYS5)       CTYPE(3C)



NAME
     isalpha, isupper, islower, isdigit, isxdigit, isalnum,
     isspace, ispunct, isprint, isgraph, iscntrl, isascii - clas-
     sify characters

USAGE
     #include <ctype.h>

     int isalpha (c)
     int c;

     . . .

DESCRIPTION
     These macros classify character-coded integer values by
     table lookup.  Each is a predicate that returns non-zero for
     true, and 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 uppercase letter.

     islower        c is a lowercase 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, new-line,
                    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.

DIAGNOSTICS
     If the argument to any of these macros is not within the



Printed 5/10/85                                           CTYPE-1



CTYPE(3C)       DOMAIN/IX Reference Manual (SYS5)       CTYPE(3C)



     domain of the function, the result is undefined.

RELATED INFORMATION
     stdio(3S), ascii(5)



















































CTYPE-2                                           Printed 5/10/85

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