isalpha(3) - NetBSD Manual Pages

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ISALPHA(3)                NetBSD Programmer's 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() re-
     turns true only for the characters for which isupper(3) or islower(3) is
     true.


RETURN VALUES

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


SEE ALSO

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


STANDARDS

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

NetBSD 1.4                       June 29, 1991                               1