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.\" Copyright (c) 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
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.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
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.\"     from: @(#)isalpha.3	5.2 (Berkeley) 6/29/91
.\"	$Id: isalpha.3,v 1.3 1993/10/15 00:58:54 jtc Exp $
.\"
.Dd June 29, 1991
.Dt ISALPHA 3
.Os
.Sh NAME
.Nm isalpha
.Nd alphabetic character test
.Sh SYNOPSIS
.Fd #include <ctype.h>
.Ft int 
.Fn isalpha "int c"
.Sh DESCRIPTION
The
.Fn isalpha
function tests for any character for which
.Xr isupper 3
or
.Xr islower 3
is true and
.\" , or any of an implementation-defined set of characters
for which none of
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr ispunct 3 ,
or
.Xr isspace 3
is true.
In the 
.Em ``C''
locale,
.Fn isalpha
returns true only for the characters for which
.Xr isupper 3
or
.Xr islower 3
is true.
.Sh RETURN VALUES
The
.Fn isalpha
macro returns zero if the character tests false and
returns non-zero if the character tests true.
.Sh SEE ALSO
.Xr isalnum 3 ,
.Xr isascii 3 ,
.Xr isblank 3 ,
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr isgraph 3 ,
.Xr islower 3 ,
.Xr isprint 3 ,
.Xr ispunct 3 ,
.Xr isspace 3 ,
.Xr isupper 3 ,
.Xr isxdigit 3 ,
.Xr toascii 3 ,
.Xr tolower 3 ,
.Xr toupper 3 ,
.Xr stdio 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn isalpha
function conforms to
.St -ansiC .