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+    <h1 id="firstHeading" class="firstHeading">acos, acosf, acosl</h1>            <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;math.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl t-since-c99"> <td> <pre data-language="c">float       acosf( float arg );</pre>
+</td> <td> (1) </td> <td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> </tr> <tr class="t-dcl"> <td> <pre data-language="c">double      acos( double arg );</pre>
+</td> <td> (2) </td> <td class="t-dcl-nopad"> </td> </tr> <tr class="t-dcl t-since-c99"> <td> <pre data-language="c">long double acosl( long double arg );</pre>
+</td> <td> (3) </td> <td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> </tr> <tr class="t-dcl t-since-c23"> <td> <pre data-language="c">_Decimal32  acosd32( _Decimal32 arg );</pre>
+</td> <td> (4) </td> <td> <span class="t-mark-rev t-since-c23">(since C23)</span> </td> </tr> <tr class="t-dcl t-since-c23"> <td> <pre data-language="c">_Decimal64  acosd64( _Decimal64 arg );</pre>
+</td> <td> (5) </td> <td> <span class="t-mark-rev t-since-c23">(since C23)</span> </td> </tr> <tr class="t-dcl t-since-c23"> <td> <pre data-language="c">_Decimal128 acosd128( _Decimal128 arg );</pre>
+</td> <td> (6) </td> <td> <span class="t-mark-rev t-since-c23">(since C23)</span> </td> </tr> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;tgmath.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl t-since-c99"> <td> <pre data-language="c">#define acos( arg )</pre>
+</td> <td> (7) </td> <td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> </tr>  </table> <div class="t-li1">
+<span class="t-li">1-6)</span> Computes the principal value of the arc cosine of <code>arg</code>.</div> <div class="t-li1">
+<span class="t-li">7)</span> Type-generic macro: If the argument has type <code>long double</code>, <span class="t-v">(3)</span> (<code>acosl</code>) is called. Otherwise, if the argument has integer type or the type <code>double</code>, <span class="t-v">(2)</span> (<code>acos</code>) is called. Otherwise, <span class="t-v">(1)</span> (<code>acosf</code>) is called. If the argument is complex, then the macro invokes the corresponding complex function (<code><a href="../complex/cacos" title="c/numeric/complex/cacos">cacosf</a></code>, <code><a href="../complex/cacos" title="c/numeric/complex/cacos">cacos</a></code>, <code><a href="../complex/cacos" title="c/numeric/complex/cacos">cacosl</a></code>).</div> <table class="t-rev-begin"> <tr class="t-rev t-since-c23">
+<td> <p>The functions <span class="t-v">(4-6)</span> are declared if and only if the implementation predefines <code>__STDC_IEC_60559_DFP__</code> (i.e. the implementation supports decimal floating-point numbers).</p>
+</td> <td><span class="t-mark-rev t-since-c23">(since C23)</span></td>
+</tr> </table>  <h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> arg </td> <td> - </td> <td> floating-point value </td>
+</tr>
+</table> <h3 id="Return_value"> Return value</h3> <p>If no errors occur, the arc cosine of <code>arg</code> (arccos(arg)) in the range [0 ; π], is returned.</p>
+<p>If a domain error occurs, an implementation-defined value is returned (NaN where supported).</p>
+<p>If a range error occurs due to underflow, the correct result (after rounding) is returned.</p>
+<h3 id="Error_handling"> Error handling</h3> <p>Errors are reported as specified in <a href="math_errhandling" title="c/numeric/math/math errhandling"><code>math_errhandling</code></a>.</p>
+<p>Domain error occurs if <code>arg</code> is outside the range <code>[-1.0; 1.0]</code>.</p>
+<p>If the implementation supports IEEE floating-point arithmetic (IEC 60559):</p>
+<ul>
+<li> If the argument is +1, the value <code>+0</code> is returned; </li>
+<li> If |arg| &gt; 1, a domain error occurs and NaN is returned; </li>
+<li> if the argument is NaN, NaN is returned. </li>
+</ul> <h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;errno.h&gt;
+#include &lt;fenv.h&gt;
+#include &lt;math.h&gt;
+#include &lt;stdio.h&gt;
+#include &lt;string.h&gt;
+ 
+#ifndef __GNUC__
+#pragma STDC FENV_ACCESS ON
+#endif
+ 
+int main(void)
+{
+    printf("acos(-1) = %f\n", acos(-1));
+    printf("acos(0.0) = %f 2*acos(0.0) = %f\n", acos(0), 2 * acos(0));
+    printf("acos(0.5) = %f 3*acos(0.5) = %f\n", acos(0.5), 3 * acos(0.5));
+    printf("acos(1) = %f\n", acos(1));
+ 
+    // error handling
+    errno = 0; feclearexcept(FE_ALL_EXCEPT);
+    printf("acos(1.1) = %f\n", acos(1.1));
+    if (errno == EDOM)
+        perror("    errno == EDOM");
+    if (fetestexcept(FE_INVALID))
+        puts("    FE_INVALID raised");
+}</pre></div> <p>Possible output:</p>
+<div class="text source-text"><pre data-language="c">acos(-1) = 3.141593
+acos(0.0) = 1.570796 2*acos(0.0) = 3.141593
+acos(0.5) = 1.047198 3*acos(0.5) = 3.141593
+acos(1) = 0.000000
+acos(1.1) = nan
+    errno == EDOM: Numerical argument out of domain
+    FE_INVALID raised</pre></div> </div> <h3 id="References"> References</h3>  <ul>
+<li> C23 standard (ISO/IEC 9899:2023): </li>
+<ul>
+<li> 7.12.4.1 The acos functions (p: TBD) </li>
+<li> 7.25 Type-generic math &lt;tgmath.h&gt; (p: TBD) </li>
+<li> F.10.1.1 The acos functions (p: TBD) </li>
+</ul>
+<li> C17 standard (ISO/IEC 9899:2018): </li>
+<ul>
+<li> 7.12.4.1 The acos functions (p: 173) </li>
+<li> 7.25 Type-generic math &lt;tgmath.h&gt; (p: 272-273) </li>
+<li> F.10.1.1 The acos functions (p: 378) </li>
+</ul>
+<li> C11 standard (ISO/IEC 9899:2011): </li>
+<ul>
+<li> 7.12.4.1 The acos functions (p: 238) </li>
+<li> 7.25 Type-generic math &lt;tgmath.h&gt; (p: 373-375) </li>
+<li> F.10.1.1 The acos functions (p: 518) </li>
+</ul>
+<li> C99 standard (ISO/IEC 9899:1999): </li>
+<ul>
+<li> 7.12.4.1 The acos functions (p: 218) </li>
+<li> 7.22 Type-generic math &lt;tgmath.h&gt; (p: 335-337) </li>
+<li> F.9.1.1 The acos functions (p: 455) </li>
+</ul>
+<li> C89/C90 standard (ISO/IEC 9899:1990): </li>
+<ul><li> 4.5.2.1 The acos function </li></ul>
+</ul>                           <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="asin" title="c/numeric/math/asin"> <span class="t-lines"><span>asin</span><span>asinf</span><span>asinl</span></span></a></div>
+<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div> </td> <td> computes arc sine (\({\small\arcsin{x} }\)arcsin(x)) <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td> <div><a href="atan" title="c/numeric/math/atan"> <span class="t-lines"><span>atan</span><span>atanf</span><span>atanl</span></span></a></div>
+<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div> </td> <td> computes arc tangent (\({\small\arctan{x} }\)arctan(x)) <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td> <div><a href="atan2" title="c/numeric/math/atan2"> <span class="t-lines"><span>atan2</span><span>atan2f</span><span>atan2l</span></span></a></div>
+<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div> </td> <td> computes arc tangent, using signs to determine quadrants <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td> <div><a href="cos" title="c/numeric/math/cos"> <span class="t-lines"><span>cos</span><span>cosf</span><span>cosl</span></span></a></div>
+<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div> </td> <td> computes cosine (\({\small\cos{x} }\)cos(x)) <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td> <div><a href="../complex/cacos" title="c/numeric/complex/cacos"> <span class="t-lines"><span>cacos</span><span>cacosf</span><span>cacosl</span></span></a></div>
+<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div> </td> <td> computes the complex arc cosine <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/numeric/math/acos" title="cpp/numeric/math/acos">C++ documentation</a></span> for <code>acos</code> </td>
+</tr> </table>           <div class="_attribution">
+  <p class="_attribution-p">
+    &copy; cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br>
+    <a href="https://en.cppreference.com/w/c/numeric/math/acos" class="_attribution-link">https://en.cppreference.com/w/c/numeric/math/acos</a>
+  </p>
+</div>