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-    <h1 id="firstHeading" class="firstHeading">log1p, log1pf, log1pl</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       log1pf( 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 t-since-c99"> <td> <pre data-language="c">double      log1p( double arg );</pre>
-</td> <td> (2) </td> <td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> </tr> <tr class="t-dcl t-since-c99"> <td> <pre data-language="c">long double log1pl( 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-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 log1p( arg )</pre>
-</td> <td> (4) </td> <td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> </tr>  </table> <div class="t-li1">
-<span class="t-li">1-3)</span> Computes the natural (base <code>e</code>) logarithm of <code>1+arg</code>. This function is more precise than the expression <code><a href="http://en.cppreference.com/w/c/numeric/math/log"><span class="kw660">log</span></a><span class="br0">(</span><span class="nu0">1</span><span class="sy2">+</span>arg<span class="br0">)</span></code> if <code>arg</code> is close to zero.</div> <div class="t-li1">
-<span class="t-li">4)</span> Type-generic macro: If <code>arg</code> has type <code>long double</code>, <code>log1pl</code> is called. Otherwise, if <code>arg</code> has integer type or the type <code>double</code>, <code>log1p</code> is called. Otherwise, <code>log1pf</code> is called.</div>  <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 ln(1+arg) is returned.</p>
-<p>If a domain error occurs, an implementation-defined value is returned (NaN where supported).</p>
-<p>If a pole error occurs, <code>-HUGE_VAL</code>, <code>-HUGE_VALF</code>, or <code>-HUGE_VALL</code> is returned.</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">math_errhandling</a>.</p>
-<p>Domain error occurs if <code>arg</code> is less than -1.</p>
-<p>Pole error may occur if <code>arg</code> is -1.</p>
-<p>If the implementation supports IEEE floating-point arithmetic (IEC 60559),</p>
-<ul>
-<li> If the argument is ±0, it is returned unmodified </li>
-<li> If the argument is -1, -∞ is returned and <code><a href="../fenv/fe_exceptions" title="c/numeric/fenv/FE exceptions">FE_DIVBYZERO</a></code> is raised. </li>
-<li> If the argument is less than -1, NaN is returned and <code><a href="../fenv/fe_exceptions" title="c/numeric/fenv/FE exceptions">FE_INVALID</a></code> is raised. </li>
-<li> If the argument is +∞, +∞ is returned </li>
-<li> If the argument is NaN, NaN is returned </li>
-</ul> <h3 id="Notes"> Notes</h3> <p>The functions <code><a href="expm1" title="c/numeric/math/expm1">expm1</a></code> and <code>log1p</code> are useful for financial calculations, for example, when calculating small daily interest rates: (1+x)<sup class="t-su">n</sup>-1 can be expressed as <code><a href="http://en.cppreference.com/w/c/numeric/math/expm1"><span class="kw659">expm1</span></a><span class="br0">(</span>n <span class="sy2">*</span> log1p<span class="br0">(</span>x<span class="br0">)</span><span class="br0">)</span></code>. These functions also simplify writing accurate inverse hyperbolic functions.</p>
-<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;stdio.h&gt;
-#include &lt;math.h&gt;
-#include &lt;float.h&gt;
-#include &lt;errno.h&gt;
-#include &lt;fenv.h&gt;
-#pragma STDC FENV_ACCESS ON
-int main(void)
-{
-    printf("log1p(0) = %f\n", log1p(0));
-    printf("Interest earned in 2 days on $100, compounded daily at 1%%\n"
-           " on a 30/360 calendar = %f\n",
-           100*expm1(2*log1p(0.01/360)));
-    printf("log(1+1e-16) = %g, but log1p(1e-16) = %g\n",
-           log(1+1e-16), log1p(1e-16));
-    // special values
-    printf("log1p(-0) = %f\n", log1p(-0.0));
-    printf("log1p(+Inf) = %f\n", log1p(INFINITY));
-    //error handling
-    errno = 0; feclearexcept(FE_ALL_EXCEPT);
-    printf("log1p(-1) = %f\n", log1p(-1));
-    if(errno == ERANGE) perror("    errno == ERANGE");
-    if(fetestexcept(FE_DIVBYZERO)) puts("    FE_DIVBYZERO raised");
-}</pre></div> <p>Possible output:</p>
-<div class="text source-text"><pre data-language="c">log1p(0) = 0.000000
-Interest earned in 2 days on $100, compounded daily at 1%
- on a 30/360 calendar = 0.005556
-log(1+1e-16) = 0, but log1p(1e-16) = 1e-16
-log1p(-0) = -0.000000
-log1p(+Inf) = Inf
-log1p(-1) = -Inf
-    errno == ERANGE: Result too large
-    FE_DIVBYZERO raised</pre></div> </div> <h3 id="References"> References</h3>  <ul>
-<li> C11 standard (ISO/IEC 9899:2011): </li>
-<ul>
-<li> 7.12.6.9 The log1p functions (p: 245) </li>
-<li> 7.25 Type-generic math &lt;tgmath.h&gt; (p: 373-375) </li>
-<li> F.10.3.9 The log1p functions (p: 522) </li>
-</ul>
-<li> C99 standard (ISO/IEC 9899:1999): </li>
-<ul>
-<li> 7.12.6.9 The log1p functions (p: 226) </li>
-<li> 7.22 Type-generic math &lt;tgmath.h&gt; (p: 335-337) </li>
-<li> F.9.3.9 The log1p functions (p: 459) </li>
-</ul>
-</ul>          <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="log" title="c/numeric/math/log"> <span class="t-lines"><span>log</span><span>logf</span><span>logl</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 natural (base-<i>e</i>) logarithm (\({\small \ln{x} }\)ln(x)) <br> <span class="t-mark">(function)</span>  </td>
-</tr> <tr class="t-dsc"> <td> <div><a href="log10" title="c/numeric/math/log10"> <span class="t-lines"><span>log10</span><span>log10f</span><span>log10l</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 common (base-<i>10</i>) logarithm (\({\small \log_{10}{x} }\)log<sub>10</sub>(x)) <br> <span class="t-mark">(function)</span>  </td>
-</tr> <tr class="t-dsc"> <td> <div><a href="log2" title="c/numeric/math/log2"> <span class="t-lines"><span>log2</span><span>log2f</span><span>log2l</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 base-2 logarithm (\({\small \log_{2}{x} }\)log<sub>2</sub>(x)) <br> <span class="t-mark">(function)</span>  </td>
-</tr> <tr class="t-dsc"> <td> <div><a href="expm1" title="c/numeric/math/expm1"> <span class="t-lines"><span>expm1</span><span>expm1f</span><span>expm1l</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 <i>e</i> raised to the given power, minus one (\({\small e^x-1}\)e<sup>x</sup>-1) <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/log1p" title="cpp/numeric/math/log1p">C++ documentation</a></span> for <code>log1p</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/log1p" class="_attribution-link">https://en.cppreference.com/w/c/numeric/math/log1p</a>
-  </p>
-</div>