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<div class="section" id="floating-point-objects">
<span id="floatobjects"></span><h1>浮點數（Floating Point）物件<a class="headerlink" href="#floating-point-objects" title="本標題的永久連結">¶</a></h1>
<span class="target" id="index-0"></span><dl class="type">
<dt id="c.PyFloatObject">
<code class="descname">PyFloatObject</code><a class="headerlink" href="#c.PyFloatObject" title="本定義的永久連結">¶</a></dt>
<dd><p>This subtype of <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyObject</span></code></a> represents a Python floating point object.</p>
</dd></dl>
<dl class="var">
<dt id="c.PyFloat_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> <code class="descname">PyFloat_Type</code><a class="headerlink" href="#c.PyFloat_Type" title="本定義的永久連結">¶</a></dt>
<dd><p>This instance of <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyTypeObject</span></code></a> represents the Python floating point
type. This is the same object as <a class="reference internal" href="../library/functions.html#float" title="float"><code class="xref py py-class docutils literal notranslate"><span class="pre">float</span></code></a> in the Python layer.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyFloat_Check">
int <code class="descname">PyFloat_Check</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *p</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_Check" title="本定義的永久連結">¶</a></dt>
<dd><p>Return true if its argument is a <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyFloatObject</span></code></a> or a subtype of
<a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyFloatObject</span></code></a>.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyFloat_CheckExact">
int <code class="descname">PyFloat_CheckExact</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *p</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_CheckExact" title="本定義的永久連結">¶</a></dt>
<dd><p>Return true if its argument is a <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyFloatObject</span></code></a>, but not a subtype of
<a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyFloatObject</span></code></a>.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyFloat_FromString">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyFloat_FromString</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *str</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_FromString" title="本定義的永久連結">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p>Create a <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyFloatObject</span></code></a> object based on the string value in <em>str</em>, or
<em>NULL</em> on failure.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyFloat_FromDouble">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyFloat_FromDouble</code><span class="sig-paren">(</span>double<em> v</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_FromDouble" title="本定義的永久連結">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p>Create a <a class="reference internal" href="#c.PyFloatObject" title="PyFloatObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyFloatObject</span></code></a> object from <em>v</em>, or <em>NULL</em> on failure.</p>
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<dt id="c.PyFloat_AsDouble">
double <code class="descname">PyFloat_AsDouble</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *pyfloat</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_AsDouble" title="本定義的永久連結">¶</a></dt>
<dd><p>Return a C <code class="xref c c-type docutils literal notranslate"><span class="pre">double</span></code> representation of the contents of <em>pyfloat</em>. If
<em>pyfloat</em> is not a Python floating point object but has a <a class="reference internal" href="../reference/datamodel.html#object.__float__" title="object.__float__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__float__()</span></code></a>
method, this method will first be called to convert <em>pyfloat</em> into a float.
This method returns <code class="docutils literal notranslate"><span class="pre">-1.0</span></code> upon failure, so one should call
<a class="reference internal" href="exceptions.html#c.PyErr_Occurred" title="PyErr_Occurred"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyErr_Occurred()</span></code></a> to check for errors.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyFloat_AS_DOUBLE">
double <code class="descname">PyFloat_AS_DOUBLE</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *pyfloat</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_AS_DOUBLE" title="本定義的永久連結">¶</a></dt>
<dd><p>Return a C <code class="xref c c-type docutils literal notranslate"><span class="pre">double</span></code> representation of the contents of <em>pyfloat</em>, but
without error checking.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyFloat_GetInfo">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyFloat_GetInfo</code><span class="sig-paren">(</span>void<span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_GetInfo" title="本定義的永久連結">¶</a></dt>
<dd><p>Return a structseq instance which contains information about the
precision, minimum and maximum values of a float. It’s a thin wrapper
around the header file <code class="file docutils literal notranslate"><span class="pre">float.h</span></code>.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyFloat_GetMax">
double <code class="descname">PyFloat_GetMax</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_GetMax" title="本定義的永久連結">¶</a></dt>
<dd><p>Return the maximum representable finite float <em>DBL_MAX</em> as C <code class="xref c c-type docutils literal notranslate"><span class="pre">double</span></code>.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyFloat_GetMin">
double <code class="descname">PyFloat_GetMin</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_GetMin" title="本定義的永久連結">¶</a></dt>
<dd><p>Return the minimum normalized positive float <em>DBL_MIN</em> as C <code class="xref c c-type docutils literal notranslate"><span class="pre">double</span></code>.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyFloat_ClearFreeList">
int <code class="descname">PyFloat_ClearFreeList</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyFloat_ClearFreeList" title="本定義的永久連結">¶</a></dt>
<dd><p>Clear the float free list. Return the number of items that could not
be freed.</p>
</dd></dl>
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