📄 nextafter.html

📁 unix 下的C开发手册,还用详细的例程。
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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>nextafter</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_874">&nbsp;</a>NAME</h4><blockquote>nextafter - next representable double-precision floating-point number</blockquote><h4><a name = "tag_000_007_875">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>#include &lt;<a href="math.h.html">math.h</a>&gt;double nextafter(double <i>x</i>, double <i>y</i>);</code></pre></blockquote><h4><a name = "tag_000_007_876">&nbsp;</a>DESCRIPTION</h4><blockquote>The<i>nextafter()</i>function computes the next representable double-precision floating-point valuefollowing <i>x</i> in the direction of <i>y</i>.Thus, if <i>y</i> is less than<i>x</i>,<i>nextafter()</i>returns the largest representable floating-pointnumber less than <i>x</i>.<p>An application wishing to check for error situations should set<i>errno</i>to 0 before calling<i>nextafter()</i>.If<i>errno</i>is non-zero on return, or the value NaN is returned,an error has occurred.</blockquote><h4><a name = "tag_000_007_877">&nbsp;</a>RETURN VALUE</h4><blockquote>The<i>nextafter()</i>function returns the next representable double-precision floating-point valuefollowing <i>x</i> in the direction of <i>y</i>.<p>If <i>x</i> or <i>y</i> is NaN, then<i>nextafter()</i>returns NaN and may set <i>errno</i> to [EDOM].<p>If <i>x</i> is finite and the correct function value would overflow, HUGE_VALis returned and<i>errno</i>is set to [ERANGE].</blockquote><h4><a name = "tag_000_007_878">&nbsp;</a>ERRORS</h4><blockquote>The<i>nextafter()</i>function will fail if:<dl compact><dt>[ERANGE]<dd>The correct value would overflow.</dl><p>The<i>nextafter()</i>function may fail if:<dl compact><dt>[EDOM]<dd>The <i>x</i> or <i>y</i> argument is NaN.</dl></blockquote><h4><a name = "tag_000_007_879">&nbsp;</a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_880">&nbsp;</a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_881">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_882">&nbsp;</a>SEE ALSO</h4><blockquote><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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