NAME
islower
- lower-case character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
int
islower(int c)
DESCRIPTION
The
islower()
function tests for any lower-case letter
for which none of
iscntrl(3),
isdigit(3),
ispunct(3),
or
isspace(3)
is true.
In the
``C''
locale,
islower()
returns true only for the characters defined as lower-case letters.
RETURN VALUES
The
islower()
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),
isdigit(3),
isgraph(3),
isprint(3),
ispunct(3),
isspace(3),
isupper(3),
isxdigit(3),
stdio(3),
toascii(3),
tolower(3),
toupper(3),
ascii(7)
STANDARDS
The
islower()
function conforms to
ANSI X3.159-1989 (``ANSI C89'') .
CAVEATS
The argument to
islower()
must be
EOF
or representable as an
otherwise, the behavior is undefined.
See the
CAVEATS
section of
ctype(3)
for more details.