CTYPE(3)                GENIX Programmer's Manual                CTYPE(3)



      NAME
           isalpha,  isupper,  islower,  isdigit,  isalnum,  isspace,  ispunct,
           isprint, iscntrl, isascii - character classification

      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 is defined on all integer values; the rest are defined  only
           where  isascii  is  true  and on the single non-ASCII value EOF (see
           stdio(3)).

           isalpha        c is a letter

           isupper        c is an upper case letter

           islower        c is a lower case letter

           isdigit        c is a digit

           isalnum        c is an alphanumeric character

           isspace        c is a  space,  tab,  carriage  return,  newline,  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)

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

           isascii        c is an ASCII character, code less than 0200

      SEE ALSO
           ascii(7)











      Printed 11/16/83                                                        1