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