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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>fmod</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_005_119"> </a>NAME</h4><blockquote>fmod - floating-point remainder value function</blockquote><h4><a name = "tag_000_005_120"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="math.h.html">math.h</a>>double fmod(double <i>x</i>, double <i>y</i>);</code></pre></blockquote><h4><a name = "tag_000_005_121"> </a>DESCRIPTION</h4><blockquote>The<i>fmod()</i>function returns the floating-point remainder of the division of<i>x</i>by<i>y</i>.<p>An application wishing to check for error situations should set<i>errno</i>to 0 before calling<i>fmod()</i>.If<i>errno</i>is non-zero on return, or the return value is NaN, an error has occurred.</blockquote><h4><a name = "tag_000_005_122"> </a>RETURN VALUE</h4><blockquote>The<i>fmod()</i>function returns the value<i>x - i * y</i>for some integer<i>i</i>such that, if<i>y</i>is non-zero, the result has the same sign as<i>x</i>and magnitude less than the magnitude of<i>y</i>.<p>If<i>x</i>or<i>y</i>is NaN, NaN is returned and<i>errno</i>may be set to [EDOM].<p>If<i>y</i>is 0,NaN is returnedand<i>errno</i>is set to [EDOM], or 0 is returned and<i>errno</i>may be set to [EDOM].<p>If<i>x</i>is ±Inf, either 0 is returned and<i>errno</i>is set to [EDOM],or NaN is returned and<i>errno</i>may be set to [EDOM].<p>If<i>y</i>is non-zero, <i>fmod</i>(±0,<i>y</i>) returns the value of<i>x</i>.If<i>x</i>is not ±Inf, <i>fmod</i>(<i>x</i>,±Inf) returns the value of<i>x</i>.<p>If the result underflows, 0 is returned and<i>errno</i>may be set to [ERANGE].</blockquote><h4><a name = "tag_000_005_123"> </a>ERRORS</h4><blockquote>The<i>fmod()</i>function may fail if:<dl compact><dt>[EDOM]<dd>One or both of the arguments is NaN,or<i>y</i>is 0, or<i>x</i>is ±Inf.<dt>[ERANGE]<dd>The result underflows.</dl><p>No other errors will occur.</blockquote><h4><a name = "tag_000_005_124"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_125"> </a>APPLICATION USAGE</h4><blockquote>Portable applications should not call<i>fmod()</i>with<i>y</i>equal to 0, because the result is implementation-dependent.The application should verify<i>y</i>is non-zero before calling<i>fmod()</i>.</blockquote><h4><a name = "tag_000_005_126"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_127"> </a>SEE ALSO</h4><blockquote><i><a href="isnan.html">isnan()</a></i>,<i><a href="math.h.html"><math.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</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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