acosh.html

来自「unix 下的C开发手册,还用详细的例程。」· HTML 代码 · 共 125 行

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>acosh</title></head><body bgcolor=white><center><font size=2>The Single UNIX &reg; Specification, Version 2<br>Copyright &copy; 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_001_086">&nbsp;</a>NAME</h4><blockquote>acosh, asinh, atanh - inverse hyperbolic functions</blockquote><h4><a name = "tag_000_001_087">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>#include &lt;<a href="math.h.html">math.h</a>&gt;double acosh(double <i>x</i>);double asinh(double <i>x</i>);double atanh(double <i>x</i>);</code></pre></blockquote><h4><a name = "tag_000_001_088">&nbsp;</a>DESCRIPTION</h4><blockquote>The<i>acosh()</i>,<i>asinh()</i>and<i>atanh()</i>functions compute the inverse hyperbolic cosine, sine, and tangent of theirargument, respectively.</blockquote><h4><a name = "tag_000_001_089">&nbsp;</a>RETURN VALUE</h4><blockquote>The<i>acosh()</i>,<i>asinh()</i>and<i>atanh()</i>functions return the inverse hyperbolic cosine, sine, and tangent of theirargument, respectively.<p>The<i>acosh()</i>function returns an implementation-dependent value (NaN or equivalent ifavailable) and sets<i>errno</i>to [EDOM] when its argument is less than 1.0.<p>The<i>atanh()</i>function returns an implementation-dependent value (NaN or equivalent ifavailable) and sets<i>errno</i>to [EDOM] when its argument has absolute value greater than 1.0.<p>If<i>x</i>is NaN, the<i>asinh()</i>,<i>acosh()</i>and<i>atanh()</i>functions return NaN and may set<i>errno</i>to [EDOM].</blockquote><h4><a name = "tag_000_001_090">&nbsp;</a>ERRORS</h4><blockquote>The<i>acosh()</i>function will fail if:<dl compact><dt>[EDOM]<dd>The <i>x</i> argument is less than 1.0.</dl><p>The<i>atanh()</i>function will fail if:<dl compact><dt>[EDOM]<dd>The <i>x</i> argument has an absolute value greater than 1.0.</dl><p>The<i>atanh()</i>function will fail if:<dl compact><dt>[ERANGE]<dd>The <i>x</i> argument has an absolute value equal to 1.0</dl><p>The<i>asinh()</i>,<i>acosh()</i>and<i>atanh()</i>functions may fail if:<dl compact><dt>[EDOM]<dd>The value of <i>x</i> is NaN.</dl></blockquote><h4><a name = "tag_000_001_091">&nbsp;</a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_092">&nbsp;</a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_093">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_094">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="cosh.html">cosh()</a></i>,<i><a href="sinh.html">sinh()</a></i>,<i><a href="tanh.html">tanh()</a></i>,<i><a href="math.h.html">&lt;math.h&gt;</a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX &reg; is a registered Trademark of The Open Group.<br>Copyright &copy; 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>

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