isxdigit
—
hexadecimal-digit character test
Standard C Library (libc, -lc)
#include <ctype.h>
int
isxdigit
(int
c);
The isxdigit
() function tests for any hexadecimal-digit
character.
The isxdigit
() function returns zero if the character
tests false and returns non-zero if the character tests true.
ctype(3),
isalnum(3),
isalpha(3),
isascii(3),
isblank(3),
iscntrl(3),
isdigit(3),
isgraph(3),
islower(3),
isprint(3),
ispunct(3),
isspace(3),
isupper(3),
stdio(3),
toascii(3),
tolower(3),
toupper(3),
ascii(7)
The isxdigit
() function conforms to
ANSI X3.159-1989 (“ANSI C89”).
The argument to isxdigit
() must be
EOF
or representable as an unsigned
char; otherwise, the behavior is undefined. See the
CAVEATS section of
ctype(3) for more details.