NAME    [Toc]    [Back]

     isalpha - alphabetic character test

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <ctype.h>

     int
     isalpha(int c);

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

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

SEE ALSO    [Toc]    [Back]

     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    [Toc]    [Back]

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

BSD                              June 29, 1991                             BSD