NAME    [Toc]    [Back]

     islower - lower-case character test

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

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 and returns
     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'').

BSD                              June 29, 1991                             BSD