@c ----------------------------------------------------------------------
@node iscntrl, ctype
@findex iscntrl
@subheading Syntax

@example
#include <ctype.h>

int iscntrl(int c);
@end example

@subheading Description

Tells if @var{c} is a control character.

@subheading Return Value

Nonzero if @var{c} is a control character, else zero.


@subheading Portability

@portability ansi, posix