ISLOWER(3)

NAME
3.6 `islower'--lowercase character predicate

SYNOPSIS
     #include <ctype.h>
     int islower(int C);

DESCRIPTION
`islower' is a macro which classifies ASCII integer values by table lookup. It is a predicate returning non-zero for minuscules (lowercase alphabetic characters), and 0 for other characters. It is defined only when `isascii'(C) is true or C is EOF.
   You can use a compiled subroutine instead of the macro definition by undefining the macro using ``#undef islower''.

RETURNS
`islower' returns non-zero if C is a lowercase letter (`a'-`z').

PORTABILITY
`islower' is ANSI C.
   No supporting OS subroutines are required.

SEE ALSO
islower is part of the library. The full documentation for is maintained as a Texinfo manual. If info and are properly installed at your site, the command

    info

will give you access to the complete manual.