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authorLeo Tenenbaum <pommicket@gmail.com>2018-08-20 21:12:06 -0400
committerLeo Tenenbaum <pommicket@gmail.com>2018-08-20 21:12:06 -0400
commit63e87c2d0c9d263f14c77b68f85c67d46ece82a9 (patch)
tree6260365cbf7d24f37d27669e8538227fcb72e243 /gtk+-mingw/share/gtk-doc/html/glib/glib-Numerical-Definitions.html
parenta4460f6d9453bbd7e584937686449cef3e19f052 (diff)
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-<a href="#glib-Numerical-Definitions.synopsis" class="shortcut">Top</a>
-  | 
- <a href="#glib-Numerical-Definitions.description" class="shortcut">Description</a>
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-<h2><span class="refentrytitle"><a name="glib-Numerical-Definitions.top_of_page"></a>Numerical Definitions</span></h2>
-<p>Numerical Definitions — mathematical constants, and floating point decomposition</p>
-</td>
-<td valign="top" align="right"></td>
-</tr></table></div>
-<div class="refsynopsisdiv">
-<a name="glib-Numerical-Definitions.synopsis"></a><h2>Synopsis</h2>
-<pre class="synopsis">
-#include &lt;glib.h&gt;
-
-#define <a class="link" href="glib-Numerical-Definitions.html#G-IEEE754-FLOAT-BIAS:CAPS" title="G_IEEE754_FLOAT_BIAS">G_IEEE754_FLOAT_BIAS</a>
-#define <a class="link" href="glib-Numerical-Definitions.html#G-IEEE754-DOUBLE-BIAS:CAPS" title="G_IEEE754_DOUBLE_BIAS">G_IEEE754_DOUBLE_BIAS</a>
-union <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754" title="union GFloatIEEE754">GFloatIEEE754</a>;
-union <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754" title="union GDoubleIEEE754">GDoubleIEEE754</a>;
-
-#define <a class="link" href="glib-Numerical-Definitions.html#G-E:CAPS" title="G_E">G_E</a>
-#define <a class="link" href="glib-Numerical-Definitions.html#G-LN2:CAPS" title="G_LN2">G_LN2</a>
-#define <a class="link" href="glib-Numerical-Definitions.html#G-LN10:CAPS" title="G_LN10">G_LN10</a>
-#define <a class="link" href="glib-Numerical-Definitions.html#G-PI:CAPS" title="G_PI">G_PI</a>
-#define <a class="link" href="glib-Numerical-Definitions.html#G-PI-2:CAPS" title="G_PI_2">G_PI_2</a>
-#define <a class="link" href="glib-Numerical-Definitions.html#G-PI-4:CAPS" title="G_PI_4">G_PI_4</a>
-#define <a class="link" href="glib-Numerical-Definitions.html#G-SQRT2:CAPS" title="G_SQRT2">G_SQRT2</a>
-#define <a class="link" href="glib-Numerical-Definitions.html#G-LOG-2-BASE-10:CAPS" title="G_LOG_2_BASE_10">G_LOG_2_BASE_10</a>
-</pre>
-</div>
-<div class="refsect1">
-<a name="glib-Numerical-Definitions.description"></a><h2>Description</h2>
-<p>
-GLib offers mathematical constants such as <a class="link" href="glib-Numerical-Definitions.html#G-PI:CAPS" title="G_PI"><span class="type">G_PI</span></a> for the value of pi;
-many platforms have these in the C library, but some don't, the GLib
-versions always exist.
-</p>
-<p>
-The <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754" title="union GFloatIEEE754"><span class="type">GFloatIEEE754</span></a> and <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754" title="union GDoubleIEEE754"><span class="type">GDoubleIEEE754</span></a> unions are used to access the
-sign, mantissa and exponent of IEEE floats and doubles. These unions are
-defined as appropriate for a given platform. IEEE floats and doubles are
-supported (used for storage) by at least Intel, PPC and Sparc. See
-<a class="ulink" href="http://en.wikipedia.org/wiki/IEEE_float" target="_top">IEEE 754-2008</a>
-for more information about IEEE number formats.
-</p>
-</div>
-<div class="refsect1">
-<a name="glib-Numerical-Definitions.details"></a><h2>Details</h2>
-<div class="refsect2">
-<a name="G-IEEE754-FLOAT-BIAS:CAPS"></a><h3>G_IEEE754_FLOAT_BIAS</h3>
-<pre class="programlisting">#define G_IEEE754_FLOAT_BIAS (127)
-</pre>
-<p>
-The bias by which exponents in single-precision floats are offset.
-</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="G-IEEE754-DOUBLE-BIAS:CAPS"></a><h3>G_IEEE754_DOUBLE_BIAS</h3>
-<pre class="programlisting">#define G_IEEE754_DOUBLE_BIAS (1023)
-</pre>
-<p>
-The bias by which exponents in double-precision floats are offset.
-</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="GFloatIEEE754"></a><h3>union GFloatIEEE754</h3>
-<pre class="programlisting">union _GFloatIEEE754
-{
- gfloat v_float;
- struct {
- guint mantissa : 23;
- guint biased_exponent : 8;
- guint sign : 1;
- } mpn;
-};
-</pre>
-<p>
-The <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754" title="union GFloatIEEE754"><span class="type">GFloatIEEE754</span></a> and <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754" title="union GDoubleIEEE754"><span class="type">GDoubleIEEE754</span></a> unions are used to access the sign,
-mantissa and exponent of IEEE floats and doubles. These unions are defined
-as appropriate for a given platform. IEEE floats and doubles are supported
-(used for storage) by at least Intel, PPC and Sparc.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody><tr>
-<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#gfloat" title="gfloat"><span class="type">gfloat</span></a> <em class="structfield"><code><a name="GFloatIEEE754.v-float"></a>v_float</code></em>;</span></p></td>
-<td>the double value</td>
-</tr></tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="GDoubleIEEE754"></a><h3>union GDoubleIEEE754</h3>
-<pre class="programlisting">union _GDoubleIEEE754
-{
- gdouble v_double;
- struct {
- guint mantissa_low : 32;
- guint mantissa_high : 20;
- guint biased_exponent : 11;
- guint sign : 1;
- } mpn;
-};
-</pre>
-<p>
-The <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754" title="union GFloatIEEE754"><span class="type">GFloatIEEE754</span></a> and <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754" title="union GDoubleIEEE754"><span class="type">GDoubleIEEE754</span></a> unions are used to access the sign,
-mantissa and exponent of IEEE floats and doubles. These unions are defined
-as appropriate for a given platform. IEEE floats and doubles are supported
-(used for storage) by at least Intel, PPC and Sparc.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody><tr>
-<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="GDoubleIEEE754.v-double"></a>v_double</code></em>;</span></p></td>
-<td>the double value</td>
-</tr></tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="G-E:CAPS"></a><h3>G_E</h3>
-<pre class="programlisting">#define G_E 2.7182818284590452353602874713526624977572470937000
-</pre>
-<p>
-The base of natural logarithms.
-</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="G-LN2:CAPS"></a><h3>G_LN2</h3>
-<pre class="programlisting">#define G_LN2 0.69314718055994530941723212145817656807550013436026
-</pre>
-<p>
-The natural logarithm of 2.
-</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="G-LN10:CAPS"></a><h3>G_LN10</h3>
-<pre class="programlisting">#define G_LN10 2.3025850929940456840179914546843642076011014886288
-</pre>
-<p>
-The natural logarithm of 10.
-</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="G-PI:CAPS"></a><h3>G_PI</h3>
-<pre class="programlisting">#define G_PI 3.1415926535897932384626433832795028841971693993751
-</pre>
-<p>
-The value of pi (ratio of circle's circumference to its diameter).
-</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="G-PI-2:CAPS"></a><h3>G_PI_2</h3>
-<pre class="programlisting">#define G_PI_2 1.5707963267948966192313216916397514420985846996876
-</pre>
-<p>
-Pi divided by 2.
-</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="G-PI-4:CAPS"></a><h3>G_PI_4</h3>
-<pre class="programlisting">#define G_PI_4 0.78539816339744830961566084581987572104929234984378
-</pre>
-<p>
-Pi divided by 4.
-</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="G-SQRT2:CAPS"></a><h3>G_SQRT2</h3>
-<pre class="programlisting">#define G_SQRT2 1.4142135623730950488016887242096980785696718753769
-</pre>
-<p>
-The square root of two.
-</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="G-LOG-2-BASE-10:CAPS"></a><h3>G_LOG_2_BASE_10</h3>
-<pre class="programlisting">#define G_LOG_2_BASE_10 (0.30102999566398119521)
-</pre>
-<p>
-Multiplying the base 2 exponent by this number yields the base 10 exponent.
-</p>
-</div>
-</div>
-</div>
-<div class="footer">
-<hr>
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