98 lines
2.3 KiB
HTML
98 lines
2.3 KiB
HTML
<html>
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<head>
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<title>
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C Guide--2.3 errno.h
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</title>
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<!-- Changed by: eric huss, 12-Mar-1997 -->
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Previous Section<br>
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2.2 ctype.h</a></td>
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2.4 float.h</a></td>
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<h1>2.3 errno.h</h1>
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<p>
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The errno header is used as a general error handler.
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<p>
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Macros:
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<blockquote><code><b>
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EDOM<br>
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ERANGE<br>
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</b></code></blockquote>
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Variables:
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<blockquote><code><b>
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errno
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</b></code></blockquote>
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<a name="edom"></a>
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<h2>2.3.1 EDOM</h2>
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<p>
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Declaration:
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<blockquote><code><b>
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#define EDOM</b></code> <i>some_value</i>
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</blockquote>
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<code><b>EDOM</b></code> is an identifier macro declared with <code><b>#define</b></code>. Its value represents a domain error
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which is returned by some math functions when a domain error occurs.
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<p>
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<a name="erange"></a>
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<h2>2.3.2 ERANGE</h2>
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<p>
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Declaration:
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<blockquote><code><b>
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#define ERANGE</b></code> <i>some_value</i>
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</blockquote>
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<code><b>ERANGE</b></code> is an identifier macro declared with <code><b>#define</b></code>. Its value represents a range error
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which is returned by some math functions when a range error occurs.
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<p>
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<a name="errno"></a>
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<h2>2.3.3 errno</h2>
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<p>
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Declaration:
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<blockquote><code><b>
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int errno;
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</b></code></blockquote>
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The <code><b>errno</b></code> variable has a value of zero at the beginning of the program. If an error
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occurs, then this variable is given the value of the error number.
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<hr>
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<a href="2.2.html">
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<img src="left.gif" border=0>
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Previous Section<br>
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2.2 ctype.h</a></td>
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Next Section
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2.4 float.h</a></td>
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