CTYPE(3-BSD)        RISC/os Reference Manual         CTYPE(3-BSD)



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, vert-
               ical 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 is



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CTYPE(3-BSD)        RISC/os Reference Manual         CTYPE(3-BSD)



               undefined if not islower(c).

     toascii   c is converted to be a valid ASCII character.

SEE ALSO
     ascii(5)

















































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