logb.html

来自「unix 下的C开发手册,还用详细的例程。」· HTML 代码 · 共 83 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>logb</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_007_439">&nbsp;</a>NAME</h4><blockquote>logb - radix-independent exponent</blockquote><h4><a name = "tag_000_007_440">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>#include &lt;<a href="math.h.html">math.h</a>&gt;double logb(double <i>x</i>);</code></pre></blockquote><h4><a name = "tag_000_007_441">&nbsp;</a>DESCRIPTION</h4><blockquote>The<i>logb()</i>function computes the exponent of <i>x</i>, which is the integral part oflog<i><sub>r</sub></i>&nbsp; |&nbsp;<i>x</i>&nbsp;|&nbsp;,as a signed floating point value, for non-zero <i>x</i>,where <i>r</i> is the radix of the machine's floating-point arithmetic.</blockquote><h4><a name = "tag_000_007_442">&nbsp;</a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>logb()</i>returns the exponent of <i>x</i>.<p>If <i>x</i> is 0.0,<i>logb()</i>returns -HUGE_VAL and sets <i>errno</i> to [EDOM].<p>If <i>x</i> is &plusmn;Inf,<i>logb()</i>returns +Inf.<p>If <i>x</i> is NaN,<i>logb()</i>returns NaN and may set <i>errno</i> to [EDOM].</blockquote><h4><a name = "tag_000_007_443">&nbsp;</a>ERRORS</h4><blockquote>The<i>logb()</i>function will fail if:<dl compact><dt>[EDOM]<dd>The <i>x</i> argument is 0.0.</dl><p>The<i>logb()</i>function may fail if:<dl compact><dt>[EDOM]<dd>The <i>x</i> argument is NaN.</dl></blockquote><h4><a name = "tag_000_007_444">&nbsp;</a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_445">&nbsp;</a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_446">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_447">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="ilogb.html">ilogb()</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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