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

@example
#include <ctype.h>

int isupper(int c);
@end example

@subheading Description

Tells if @var{c} is an upper case character or not.

@subheading Return Value

Nonzero if @var{c} is upper case, else zero.


@subheading Portability

@portability ansi, posix