@c ----------------------------------------------------------------------
@node isalpha, ctype
@subheading Syntax

@example
#include <ctype.h>

int isalpha(int c);
@end example

@subheading Description

Tells if @var{c} is a letter.

@subheading Return Value

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


@subheading Portability

@portability ansi, posix