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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>log1p</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_007_430"> </a>NAME</h4><blockquote>log1p - compute a natural logarithm</blockquote><h4><a name = "tag_000_007_431"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="math.h.html">math.h</a>>double log1p (double <i>x</i>);</code></pre></blockquote><h4><a name = "tag_000_007_432"> </a>DESCRIPTION</h4><blockquote>The<i>log1p()</i>function computes log<sub><small>e</small></sub>(1.0 + <i>x</i>). The value of<i>x</i>must be greater than -1.0.</blockquote><h4><a name = "tag_000_007_433"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>log1p()</i>returns the natural logarithm of 1.0 +<i>x.</i><p>If <i>x</i> is NaN,<i>log1p()</i>returns NaN and may set <i>errno</i> to [EDOM].<p>If <i>x</i> is less than -1.0,<i>log1p()</i>returns -HUGE_VAL or NaN and sets <i>errno</i> to [EDOM].<p>If <i>x</i> is -1.0,<i>log1p()</i>returns -HUGE_VAL and may set <i>errno</i> to [ERANGE].</blockquote><h4><a name = "tag_000_007_434"> </a>ERRORS</h4><blockquote>The<i>log1p()</i>function will fail if:<dl compact><dt>[EDOM]<dd>The value of <i>x</i> is less than -1.0.</dl><p>The<i>log1p()</i>function may fail and set <i>errno</i> to:<dl compact><dt>[EDOM]<dd>The value of <i>x</i> is NaN.<dt>[ERANGE]<dd>The value of <i>x</i> is -1.0.</dl><p>No other errors will occur.</blockquote><h4><a name = "tag_000_007_435"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_436"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_437"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_438"> </a>SEE ALSO</h4><blockquote><i><a href="log.html">log()</a></i>,<i><a href="math.h.html"><math.h></a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 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>⌨️ 快捷键说明
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