ISALPHA(3) | Library Functions Manual | ISALPHA(3) |
isalpha
—
alphabetic character test
#include
<ctype.h>
int
isalpha
(int
c);
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.
The isalpha
() function returns zero if the
character tests false or non-zero if the character tests true.
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)
The isalpha
() function conforms to
ANSI X3.159-1989
(“ANSI C89”).
The isalpha
() function first appeared in
Version 7 AT&T UNIX.
The argument to isalpha
() must be
EOF
or representable as an unsigned
char
; otherwise, the result is undefined.
July 18, 2013 | OpenBSD-6.1 |