mathalib.html

Vxworks API操作系统和驱动程序设计API。压缩的HTML文件

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double fmod
    (
    double x,   /* numerator   */
    double y    /* denominator */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
<p>
The double-precision modulus of <i>x</i>/<i>y</i> with the sign of <i>x</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>, Kernighan & Ritchie:
<i>The C Programming Language, 2nd Edition</i>

<hr>
<a name="infinity"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>infinity(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>infinity(&nbsp;)</strong> - return a very large double</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double infinity (void)
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

This routine returns a very large double.
<p>
</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The double-precision representation of positive infinity.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>

<hr>
<a name="irint"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>irint(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>irint(&nbsp;)</strong> - convert a double-precision value to an integer</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>int irint
    (
    double x  /* argument */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

This routine converts a double-precision value <i>x</i> to an integer
using the selected IEEE rounding direction.
<p>
</blockquote><h4>CAVEAT</h4><blockquote><p>
<p>
The rounding direction is not pre-selectable and is fixed for
round-to-the-nearest.
<p>
</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The integer representation of <i>x</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>

<hr>
<a name="iround"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>iround(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>iround(&nbsp;)</strong> - round a number to the nearest integer</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>int iround
    (
    double x    /* argument */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

This routine rounds a double-precision value <i>x</i> to the nearest
integer value.
<p>
</blockquote><h4>NOTE</h4><blockquote><p>
<p>
If <i>x</i> is spaced evenly between two integers, it returns the even integer.
<p>
</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The integer nearest to <i>x</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>

<hr>
<a name="log"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>log(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>log(&nbsp;)</strong> - compute a natural logarithm (ANSI)</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double log
    (
    double x    /* value to compute the natural logarithm of */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The double-precision natural logarithm of <i>x</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>, Kernighan & Ritchie:
<i>The C Programming Language, 2nd Edition</i>

<hr>
<a name="log10"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>log10(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>log10(&nbsp;)</strong> - compute a base-10 logarithm (ANSI)</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double log10
    (
    double x    /* value to compute the base-10 logarithm of */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The double-precision base-10 logarithm of <i>x</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>, Kernighan & Ritchie:
<i>The C Programming Language, 2nd Edition</i>

<hr>
<a name="log2"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>log2(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>log2(&nbsp;)</strong> - compute a base-2 logarithm</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double log2
    (
    double x  /* value to compute the base-two logarithm of */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

This routine returns the base-2 logarithm of <i>x</i> in double precision.
<p>
</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The double-precision base-2 logarithm of <i>x</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>

<hr>
<a name="pow"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>pow(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>pow(&nbsp;)</strong> - compute the value of a number raised to a specified power (ANSI)</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double pow
    (
    double x,   /* operand  */
    double y    /* exponent */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The double-precision value of <i>x</i> to the power of <i>y</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>, Kernighan & Ritchie:
<i>The C Programming Language, 2nd Edition</i>

<hr>
<a name="round"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>round(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>round(&nbsp;)</strong> - round a number to the nearest integer</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double round
    (
    double x  /* value to round */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

This routine rounds a double-precision value <i>x</i> to the nearest
integral value.
<p>
</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The double-precision representation of <i>x</i> rounded to the
nearest integral value.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>

<hr>
<a name="sin"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>sin(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>sin(&nbsp;)</strong> - compute a sine (ANSI)</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double sin
    (    
    double x    /* angle in radians */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The double-precision floating-point sine of <i>x</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>, Kernighan & Ritchie:
<i>The C Programming Language, 2nd Edition</i>

<hr>
<a name="sincos"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>sincos(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>sincos(&nbsp;)</strong> - compute both a sine and cosine</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>void sincos
    (
    double x,          /* angle in radians */
    double *sinResult, /* sine result buffer */
    double *cosResult  /* cosine result buffer */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

This routine computes both the sine and cosine of <i>x</i> in double precision.
The sine is copied to <i>sinResult</i> and the cosine is copied to <i>cosResult</i>.
<p>
</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
N/A
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>

<hr>
<a name="sinh"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>sinh(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>sinh(&nbsp;)</strong> - compute a hyperbolic sine (ANSI)</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double sinh
    (
    double x    /* angle in radians */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The double-precision hyperbolic sine of <i>x</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>, Kernighan & Ritchie:
<i>The C Programming Language, 2nd Edition</i>

<hr>
<a name="sqrt"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>sqrt(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>sqrt(&nbsp;)</strong> - compute a non-negative square root (ANSI)</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double sqrt
    (
    double x    /* value to compute the square root of */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
INCLUDE FILES: <b>math.h</b> 
<p>

<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The double-precision square root of <i>x</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>, Kernighan & Ritchie:
<i>The C Programming Language, 2nd Edition</i>

<hr>
<a name="tan"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>tan(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>tan(&nbsp;)</strong> - compute a tangent (ANSI)</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double tan
    (
    double x    /* angle in radians */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The double-precision tangent of <i>x</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>, Kernighan & Ritchie:
<i>The C Programming Language, 2nd Edition</i>

<hr>
<a name="tanh"></a>
<p align=right>
<a href="rtnIndex.htm"><i>OS Libraries :  Routines</i></a></p>

</blockquote><h1>tanh(&nbsp;)</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote>  
<p><strong>tanh(&nbsp;)</strong> - compute a hyperbolic tangent (ANSI)</p>

</blockquote><h4>SYNOPSIS</h4><blockquote><p>
<pre>double tanh
    (
    double x    /* angle in radians */
    )
</pre>

</blockquote><h4>DESCRIPTION</h4><blockquote><p>
<p>

</blockquote><h4>INCLUDE FILES</h4><blockquote><p>
<b>math.h</b> 
<p>
</blockquote><h4>RETURNS</h4><blockquote><p>
The double-precision hyperbolic tangent of <i>x</i>.
<p>
</blockquote><h4>SEE ALSO</h4><blockquote><p>
<b><a href="./mathALib.html#top">mathALib</a></b>, Kernighan & Ritchie:
<i>The C Programming Language, 2nd Edition</i>