134 lines
4.4 KiB
HTML
134 lines
4.4 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>fetestexcept</title>
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<basefont size="3"> <a name="fetestexcept"></a> <a name="tag_03_158"></a><!-- fetestexcept -->
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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_158_01"></a>NAME</h4>
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<blockquote>fetestexcept - test floating-point exception flags</blockquote>
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<h4><a name="tag_03_158_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/fenv.h.html">fenv.h</a>><br>
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<br>
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int fetestexcept(int</tt> <i>excepts</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_158_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>fetestexcept</i>() function shall determine which of a specified subset of the floating-point exception flags are
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currently set. The <i>excepts</i> argument specifies the floating-point status flags to be queried.</p>
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</blockquote>
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<h4><a name="tag_03_158_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>The <i>fetestexcept</i>() function shall return the value of the bitwise-inclusive OR of the floating-point exception macros
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corresponding to the currently set floating-point exceptions included in <i>excepts</i>.</p>
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</blockquote>
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<h4><a name="tag_03_158_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</p>
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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_158_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>The following example calls function <i>f</i>() if an invalid exception is set, and then function <i>g</i>() if an overflow
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exception is set:</p>
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<pre>
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<tt>#include <fenv.h>
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/* ... */
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{
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# pragma STDC FENV_ACCESS ON
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int set_excepts;
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feclearexcept(FE_INVALID | FE_OVERFLOW);
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// maybe raise exceptions
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set_excepts = fetestexcept(FE_INVALID | FE_OVERFLOW);
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if (set_excepts & FE_INVALID) f();
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if (set_excepts & FE_OVERFLOW) g();
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/* ... */
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}
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_03_158_07"></a>APPLICATION USAGE</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_158_08"></a>RATIONALE</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_158_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_158_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="fegetexceptflag.html"><i>fegetexceptflag</i>()</a> , <a href=
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"feraiseexcept.html"><i>feraiseexcept</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/fenv.h.html"><i><fenv.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_158_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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