math.h.html

IEEE 1003.1-2003, Single Unix Specification v3

long double copysignl(long double, long double);
double      cos(double);
float       cosf(float);
double      cosh(double);
float       coshf(float);
long double coshl(long double);
long double cosl(long double);
double      erf(double);
double      erfc(double);
float       erfcf(float);
long double erfcl(long double);
float       erff(float);
long double erfl(long double);
double      exp(double);
double      exp2(double);
float       exp2f(float);
long double exp2l(long double);
float       expf(float);
long double expl(long double);
double      expm1(double);
float       expm1f(float);
long double expm1l(long double);
double      fabs(double);
float       fabsf(float);
long double fabsl(long double);
double      fdim(double, double);
float       fdimf(float, float);
long double fdiml(long double, long double);
double      floor(double);
float       floorf(float);
long double floorl(long double);
double      fma(double, double, double);
float       fmaf(float, float, float);
long double fmal(long double, long double, long double);
double      fmax(double, double);
float       fmaxf(float, float);
long double fmaxl(long double, long double);
double      fmin(double, double);
float       fminf(float, float);
long double fminl(long double, long double);
double      fmod(double, double);
float       fmodf(float, float);
long double fmodl(long double, long double);
double      frexp(double, int *);
float       frexpf(float value, int *);
long double frexpl(long double value, int *);
double      hypot(double, double);
float       hypotf(float, float);
long double hypotl(long double, long double);
int         ilogb(double);
int         ilogbf(float);
int         ilogbl(long double);
<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
double      j0(double);
double      j1(double);
double      jn(int, double);
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
double      ldexp(double, int);
float       ldexpf(float, int);
long double ldexpl(long double, int);
double      lgamma(double);
float       lgammaf(float);
long double lgammal(long double);
long long   llrint(double);
long long   llrintf(float);
long long   llrintl(long double);
long long   llround(double);
long long   llroundf(float);
long long   llroundl(long double);
double      log(double);
double      log10(double);
float       log10f(float);
long double log10l(long double);
double      log1p(double);
float       log1pf(float);
long double log1pl(long double);
double      log2(double);
float       log2f(float);
long double log2l(long double);
double      logb(double);
float       logbf(float);
long double logbl(long double);
float       logf(float);
long double logl(long double);
long        lrint(double);
long        lrintf(float);
long        lrintl(long double);
long        lround(double);
long        lroundf(float);
long        lroundl(long double);
double      modf(double, double *);
float       modff(float, float *);
long double modfl(long double, long double *);
double      nan(const char *);
float       nanf(const char *);
long double nanl(const char *);
double      nearbyint(double);
float       nearbyintf(float);
long double nearbyintl(long double);
double      nextafter(double, double);
float       nextafterf(float, float);
long double nextafterl(long double, long double);
double      nexttoward(double, long double);
float       nexttowardf(float, long double);
long double nexttowardl(long double, long double);
double      pow(double, double);
float       powf(float, float);
long double powl(long double, long double);
double      remainder(double, double);
float       remainderf(float, float);
long double remainderl(long double, long double);
double      remquo(double, double, int *);
float       remquof(float, float, int *);
long double remquol(long double, long double, int *);
double      rint(double);
float       rintf(float);
long double rintl(long double);
double      round(double);
float       roundf(float);
long double roundl(long double);
<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
double      scalb(double, double);
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
double      scalbln(double, long);
float       scalblnf(float, long);
long double scalblnl(long double, long);
double      scalbn(double, int);
float       scalbnf(float, int);
long double scalbnl(long double, int);
double      sin(double);
float       sinf(float);
double      sinh(double);
float       sinhf(float);
long double sinhl(long double);
long double sinl(long double);
double      sqrt(double);
float       sqrtf(float);
long double sqrtl(long double);
double      tan(double);
float       tanf(float);
double      tanh(double);
float       tanhf(float);
long double tanhl(long double);
long double tanl(long double);
double      tgamma(double);
float       tgammaf(float);
long double tgammal(long double);
double      trunc(double);
float       truncf(float);
long double truncl(long double);
<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
double      y0(double);
double      y1(double);
double      yn(int, double);
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
</tt>
</pre>

<p>The following external variable shall be defined:</p>

<pre>
<tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
extern int signgam;
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
</tt>
</pre>

<p>The behavior of each of the functions defined in <i>&lt;math.h&gt;</i> is specified in the System Interfaces volume of
IEEE&nbsp;Std&nbsp;1003.1-2001 for all representable values of its input arguments, except where stated otherwise. Each function
shall execute as if it were a single operation without generating any externally visible exceptional conditions.</p>
</blockquote>

<hr>
<div class="box"><em>The following sections are informative.</em></div>

<h4><a name="tag_13_26_04"></a>APPLICATION USAGE</h4>

<blockquote>
<p>The FP_CONTRACT pragma can be used to allow (if the state is on) or disallow (if the state is off) the implementation to
contract expressions. Each pragma can occur either outside external declarations or preceding all explicit declarations and
statements inside a compound statement. When outside external declarations, the pragma takes effect from its occurrence until
another FP_CONTRACT pragma is encountered, or until the end of the translation unit. When inside a compound statement, the pragma
takes effect from its occurrence until another FP_CONTRACT pragma is encountered (including within a nested compound statement), or
until the end of the compound statement; at the end of a compound statement the state for the pragma is restored to its condition
just before the compound statement. If this pragma is used in any other context, the behavior is undefined. The default state (on
or off) for the pragma is implementation-defined.</p>
</blockquote>

<h4><a name="tag_13_26_05"></a>RATIONALE</h4>

<blockquote>
<p>Before the ISO/IEC&nbsp;9899:1999 standard, the math library was defined only for the floating type <b>double</b>. All the names
formed by appending <tt>'f'</tt> or <tt>'l'</tt> to a name in <i>&lt;math.h&gt;</i> were reserved to allow for the definition of
<b>float</b> and <b>long double</b> libraries; and the ISO/IEC&nbsp;9899:1999 standard provides for all three versions of math
functions.</p>

<p>The functions <a href="../functions/ecvt.html"><i>ecvt</i>()</a>, <a href="../functions/fcvt.html"><i>fcvt</i>()</a>, and <a
href="../functions/gcvt.html"><i>gcvt</i>()</a> have been dropped from the ISO&nbsp;C standard since their capability is available
through <a href="../functions/sprintf.html"><i>sprintf</i>()</a>. These are provided on XSI-conformant systems supporting the
Legacy Option Group.</p>
</blockquote>

<h4><a name="tag_13_26_06"></a>FUTURE DIRECTIONS</h4>

<blockquote>
<p>None.</p>
</blockquote>

<h4><a name="tag_13_26_07"></a>SEE ALSO</h4>

<blockquote>
<p><a href="stddef.h.html"><i>&lt;stddef.h&gt;</i></a> , <a href="sys/types.h.html"><i>&lt;sys/types.h&gt;</i></a> , the System
Interfaces volume of IEEE&nbsp;Std&nbsp;1003.1-2001, <a href="../functions/acos.html"><i>acos</i>()</a>, <a href=
"../functions/acosh.html"><i>acosh</i>()</a>, <a href="../functions/asin.html"><i>asin</i>()</a>, <a href=
"../functions/atan.html"><i>atan</i>()</a>, <a href="../functions/atan2.html"><i>atan2</i>()</a>, <a href=
"../functions/cbrt.html"><i>cbrt</i>()</a>, <a href="../functions/ceil.html"><i>ceil</i>()</a>, <a href=
"../functions/cos.html"><i>cos</i>()</a>, <a href="../functions/cosh.html"><i>cosh</i>()</a>, <a href=
"../functions/erf.html"><i>erf</i>()</a>, <a href="../functions/exp.html"><i>exp</i>()</a>, <a href=
"../functions/expm1.html"><i>expm1</i>()</a>, <a href="../functions/fabs.html"><i>fabs</i>()</a>, <a href=
"../functions/floor.html"><i>floor</i>()</a>, <a href="../functions/fmod.html"><i>fmod</i>()</a>, <a href=
"../functions/frexp.html"><i>frexp</i>()</a>, <a href="../functions/hypot.html"><i>hypot</i>()</a>, <a href=
"../functions/ilogb.html"><i>ilogb</i>()</a>, <a href="../functions/isnan.html"><i>isnan</i>()</a>, <a href=
"../functions/j0.html"><i>j0</i>()</a>, <a href="../functions/ldexp.html"><i>ldexp</i>()</a>, <a href=
"../functions/lgamma.html"><i>lgamma</i>()</a>, <a href="../functions/log.html"><i>log</i>()</a>, <a href=
"../functions/log10.html"><i>log10</i>()</a>, <a href="../functions/log1p.html"><i>log1p</i>()</a>, <a href=
"../functions/logb.html"><i>logb</i>()</a>, <a href="../functions/modf.html"><i>modf</i>()</a>, <a href=
"../functions/nextafter.html"><i>nextafter</i>()</a>, <a href="../functions/pow.html"><i>pow</i>()</a>, <a href=
"../functions/remainder.html"><i>remainder</i>()</a>, <a href="../functions/rint.html"><i>rint</i>()</a>, <a href=
"../functions/scalb.html"><i>scalb</i>()</a>, <a href="../functions/sin.html"><i>sin</i>()</a>, <a href=
"../functions/sinh.html"><i>sinh</i>()</a>, <a href="../functions/sqrt.html"><i>sqrt</i>()</a>, <a href=
"../functions/tan.html"><i>tan</i>()</a>, <a href="../functions/tanh.html"><i>tanh</i>()</a>, <a href=
"../functions/y0.html"><i>y0</i>()</a></p>
</blockquote>

<h4><a name="tag_13_26_08"></a>CHANGE HISTORY</h4>

<blockquote>
<p>First released in Issue 1.</p>
</blockquote>

<h4><a name="tag_13_26_09"></a>Issue 6</h4>

<blockquote>
<p>This reference page is updated to align with the ISO/IEC&nbsp;9899:1999 standard.<br>
</p>

</blockquote>

<div class="box"><em>End of informative text.</em></div>

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