isalpha(3) - NetBSD Manual Pages

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ISALPHA(3)              NetBSD Library Functions Manual             ISALPHA(3)


NAME

     isalpha -- alphabetic character test


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <ctype.h>

     int
     isalpha(int c);


DESCRIPTION

     The isalpha() function tests for any character for which isupper(3) or
     islower(3) is true and for which none of iscntrl(3), isdigit(3),
     ispunct(3), or isspace(3) is true.  In the ``C'' locale, isalpha()
     returns true only for the characters for which isupper(3) or islower(3)
     is true.


RETURN VALUES

     The isalpha() function returns zero if the character tests false and
     returns non-zero if the character tests true.


SEE ALSO

     ctype(3), isalnum(3), isascii(3), isblank(3), iscntrl(3), isdigit(3),
     isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3),
     isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)


STANDARDS

     The isalpha() function conforms to ANSI X3.159-1989 (``ANSI C89'').


CAVEATS

     The argument to isalpha() must be EOF or representable as an unsigned
     char; otherwise, the behavior is undefined.  See the CAVEATS section of
     ctype(3) for more details.

NetBSD 10.1                     April 17, 2008                     NetBSD 10.1