ISALNUM(3) | Library Functions Manual | ISALNUM(3) |
isalnum
—
alphanumeric character test
#include
<ctype.h>
int
isalnum
(int
c);
The
isalnum
()
function tests for any character for which
isalpha(3) or
isdigit(3) is true.
The isalnum
() function returns zero if the
character tests false or non-zero if the character tests true.
isalpha(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 isalnum
() function conforms to
ANSI X3.159-1989
(“ANSI C89”).
The isalnum
() function first appeared in
Version 7 AT&T UNIX.
The argument to isalnum
() must be
EOF
or representable as an unsigned
char
; otherwise, the result is undefined.
July 17, 2013 | OpenBSD-6.1 |