NAME    [Toc]    [Back]

     islower - lower-case character test

SYNOPSIS    [Toc]    [Back]

     #include <ctype.h>

     int
     islower(int c);

DESCRIPTION    [Toc]    [Back]

     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 lowercase
 letters.

RETURN VALUES    [Toc]    [Back]

     The  islower()  macro  returns  zero  if the character tests
false or non-zero
     if the character tests true.

SEE ALSO    [Toc]    [Back]

     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    [Toc]    [Back]

     The islower() function conforms to ANSI X3.159-1989  (``ANSI
C'').

CAVEATS    [Toc]    [Back]

     The argument to islower() must be EOF or representable as an
unsigned
     char; otherwise, the result is undefined.

OpenBSD     3.6                           June      29,      1991