148 lines
6.3 KiB
HTML
148 lines
6.3 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>remquo</title>
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<basefont size="3"> <a name="remquo"></a> <a name="tag_03_607"></a><!-- remquo -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_607_01"></a>NAME</h4>
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<blockquote>remquo, remquof, remquol - remainder functions</blockquote>
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<h4><a name="tag_03_607_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/math.h.html">math.h</a>><br>
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<br>
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double remquo(double</tt> <i>x</i><tt>, double</tt> <i>y</i><tt>, int *</tt><i>quo</i><tt>);<br>
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float remquof(float</tt> <i>x</i><tt>, float</tt> <i>y</i><tt>, int *</tt><i>quo</i><tt>);<br>
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long double remquol(long double</tt> <i>x</i><tt>, long double</tt> <i>y</i><tt>, int *</tt><i>quo</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_607_03"></a>DESCRIPTION</h4>
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<blockquote>
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<div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"
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border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
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requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
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the ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div>
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<p>The <i>remquo</i>(), <i>remquof</i>(), and <i>remquol</i>() functions shall compute the same remainder as the <a href=
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"../functions/remainder.html"><i>remainder</i>()</a>, <a href="../functions/remainderf.html"><i>remainderf</i>()</a>, and <a href=
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"../functions/remainderl.html"><i>remainderl</i>()</a> functions, respectively. In the object pointed to by <i>quo</i>, they store
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a value whose sign is the sign of <i>x</i>/ <i>y</i> and whose magnitude is congruent modulo 2<i><small><sup>n</sup></small></i> to
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the magnitude of the integral quotient of <i>x</i>/ <i>y</i>, where <i>n</i> is an implementation-defined integer greater than or
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equal to 3.</p>
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<p>An application wishing to check for error situations should set <i>errno</i> to zero and call
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<i>feclearexcept</i>(FE_ALL_EXCEPT) before calling these functions. On return, if <i>errno</i> is non-zero or
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<i>fetestexcept</i>(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred.</p>
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</blockquote>
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<h4><a name="tag_03_607_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>These functions shall return <i>x</i> REM <i>y</i>.</p>
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<p><sup>[<a href="javascript:open_code('MX')">MX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> If
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<i>x</i> or <i>y</i> is NaN, a NaN shall be returned.</p>
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<p>If <i>x</i> is ±Inf or <i>y</i> is zero and the other argument is non-NaN, a domain error shall occur, and either a NaN
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(if supported), or an implementation-defined value shall be returned. <img src="../images/opt-end.gif" alt="[Option End]" border=
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"0"></p>
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</blockquote>
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<h4><a name="tag_03_607_05"></a>ERRORS</h4>
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<blockquote>
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<p>These functions shall fail if:</p>
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<dl compact>
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<dt>Domain Error</dt>
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<dd><sup>[<a href="javascript:open_code('MX')">MX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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The <i>x</i> argument is ±Inf, or the <i>y</i> argument is ±0 and the other argument is non-NaN.
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<p>If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then <i>errno</i> shall be set to [EDOM]. If the
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integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the invalid floating-point exception shall be raised.
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<img src="../images/opt-end.gif" alt="[Option End]" border="0"></p>
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</dd>
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</dl>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_607_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_607_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are independent of
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each other, but at least one of them must be non-zero.</p>
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</blockquote>
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<h4><a name="tag_03_607_08"></a>RATIONALE</h4>
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<blockquote>
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<p>These functions are intended for implementing argument reductions which can exploit a few low-order bits of the quotient. Note
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that <i>x</i> may be so large in magnitude relative to <i>y</i> that an exact representation of the quotient is not practical.</p>
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</blockquote>
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<h4><a name="tag_03_607_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_607_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="feclearexcept.html"><i>feclearexcept</i>()</a> , <a href="fetestexcept.html"><i>fetestexcept</i>()</a> , <a href=
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"remainder.html"><i>remainder</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/xbd_chap04.html#tag_04_18">Section 4.18, Treatment of Error Conditions for Mathematical Functions</a>, <a href=
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"../basedefs/math.h.html"><i><math.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_607_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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