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<html>
<head>
<title>
C Guide--2.3 errno.h
</title>
<!-- Changed by: eric huss, 12-Mar-1997 -->
</head>
<body text="#000000" bgcolor="#FFFFFF">
<center>
<table border=0 width=100%>
<tr>
<td align=left width=20% valign=top>
<a href="2.2.html">
<img src="left.gif" border=0>
Previous Section<br>
2.2 ctype.h</a></td>
<td align=center width=60% valign=top>
| <a href="index.html">Table of Contents</a> |
<a href="index2.html">Index</a> |</td>
<td align=right width=20% valign=top>
<a href="2.4.html">
Next Section
<img src="right.gif" border=0><br>
2.4 float.h</a></td>
</tr>
</table>
</center>
<hr>
<h1>2.3 errno.h</h1>
<p>
The errno header is used as a general error handler.
<p>
Macros:
<blockquote><code><b>
EDOM<br>
ERANGE<br>
</b></code></blockquote>
Variables:
<blockquote><code><b>
errno
</b></code></blockquote>
<a name="edom"></a>
<h2>2.3.1 EDOM</h2>
<p>
Declaration:
<blockquote><code><b>
#define EDOM</b></code> <i>some_value</i>
</blockquote>
<code><b>EDOM</b></code> is an identifier macro declared with <code><b>#define</b></code>. Its value represents a domain error
which is returned by some math functions when a domain error occurs.
<p>
<a name="erange"></a>
<h2>2.3.2 ERANGE</h2>
<p>
Declaration:
<blockquote><code><b>
#define ERANGE</b></code> <i>some_value</i>
</blockquote>
<code><b>ERANGE</b></code> is an identifier macro declared with <code><b>#define</b></code>. Its value represents a range error
which is returned by some math functions when a range error occurs.
<p>
<a name="errno"></a>
<h2>2.3.3 errno</h2>
<p>
Declaration:
<blockquote><code><b>
int errno;
</b></code></blockquote>
The <code><b>errno</b></code> variable has a value of zero at the beginning of the program. If an error
occurs, then this variable is given the value of the error number.
<hr>
<center>
<table border=0 width=100%>
<tr>
<td align=left width=20% valign=top>
<a href="2.2.html">
<img src="left.gif" border=0>
Previous Section<br>
2.2 ctype.h</a></td>
<td align=center width=60% valign=top>
| <a href="index.html">Table of Contents</a> |
<a href="index2.html">Index</a> |</td>
<td align=right width=20% valign=top>
<a href="2.4.html">
Next Section
<img src="right.gif" border=0><br>
2.4 float.h</a></td>
</tr>
</table>
</center>
</body>
</html>