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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
<title>isascii</title>
</head>
<body bgcolor="white">
<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="isascii"></a> <a name="tag_03_285"></a><!-- isascii -->
<!--header start-->
<center><font size="2">The Open Group Base Specifications Issue 6<br>
IEEE Std 1003.1-2001<br>
Copyright &copy; 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
<!--header end-->
<hr size="2" noshade>
<h4><a name="tag_03_285_01"></a>NAME</h4>
<blockquote>isascii - test for a 7-bit US-ASCII character</blockquote>
<h4><a name="tag_03_285_02"></a>SYNOPSIS</h4>
<blockquote class="synopsis">
<div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
"[Option Start]" border="0"> #include &lt;<a href="../basedefs/ctype.h.html">ctype.h</a>&gt;<br>
<br>
int isascii(int</tt> <i>c</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
<tt><br>
</tt></blockquote>
<h4><a name="tag_03_285_03"></a>DESCRIPTION</h4>
<blockquote>
<p>The <i>isascii</i>() function shall test whether <i>c</i> is a 7-bit US-ASCII character code.</p>
<p>The <i>isascii</i>() function is defined on all integer values.</p>
</blockquote>
<h4><a name="tag_03_285_04"></a>RETURN VALUE</h4>
<blockquote>
<p>The <i>isascii</i>() function shall return non-zero if <i>c</i> is a 7-bit US-ASCII character code between 0 and octal 0177
inclusive; otherwise, it shall return 0.</p>
</blockquote>
<h4><a name="tag_03_285_05"></a>ERRORS</h4>
<blockquote>
<p>No errors are defined.</p>
</blockquote>
<hr>
<div class="box"><em>The following sections are informative.</em></div>
<h4><a name="tag_03_285_06"></a>EXAMPLES</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_285_07"></a>APPLICATION USAGE</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_285_08"></a>RATIONALE</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_285_09"></a>FUTURE DIRECTIONS</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_285_10"></a>SEE ALSO</h4>
<blockquote>
<p>The Base Definitions volume of IEEE&nbsp;Std&nbsp;1003.1-2001, <a href="../basedefs/ctype.h.html"><i>&lt;ctype.h&gt;</i></a></p>
</blockquote>
<h4><a name="tag_03_285_11"></a>CHANGE HISTORY</h4>
<blockquote>
<p>First released in Issue 1. Derived from Issue 1 of the SVID.</p>
</blockquote>
<div class="box"><em>End of informative text.</em></div>
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