NAME
isdigit
- decimal-digit character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
int
isdigit(int c)
DESCRIPTION
The
isdigit()
function tests for any decimal-digit character.
RETURN VALUES
The
isdigit()
function returns zero if the character tests false and
returns non-zero if the character tests true.
SEE ALSO
ctype(3),
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)
STANDARDS
The
isdigit()
function conforms to
ANSI X3.159-1989 (``ANSI C89'') .
CAVEATS
The argument to
isdigit()
must be
EOF
or representable as an
otherwise, the behavior is undefined.
See the
CAVEATS
section of
ctype(3)
for more details.