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Command: islower | Section: 3 | Source: MINIX | File: islower.3
ISLOWER(3) FreeBSD Library Functions Manual ISLOWER(3)
NAME
islower - lower-case character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h>
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 unsigned
char; otherwise, the behavior is undefined. See the CAVEATS section of
ctype(3) for more details.
FreeBSD 14.1-RELEASE-p8 April 17, 2008 FreeBSD 14.1-RELEASE-p8