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58<span id="Floating-Type-Specs"></span><div class="header">
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60Next: <a href="Special-Float-Values.html" accesskey="n" rel="next">Special Float Values</a>, Previous: <a href="Floating-Representations.html" accesskey="p" rel="prev">Floating Representations</a>, Up: <a href="Floating-Point-in-Depth.html" accesskey="u" rel="up">Floating Point in Depth</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Index.html" title="Index" rel="index">Index</a>]</p>
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63<span id="Floating_002dPoint-Type-Specifications"></span><h3 class="section">28.2 Floating-Point Type Specifications</h3>
64
65<p>The standard library header file <samp>float.h</samp> defines a number of
66constants that describe the platform&rsquo;s implementation of
67floating-point types <code>float</code>, <code>double</code> and <code>long
68double</code>. They include:
69</p>
70<span id="index-FLT_005fMIN"></span>
71<span id="index-DBL_005fMIN"></span>
72<span id="index-LDBL_005fMIN"></span>
73<span id="index-FLT_005fHAS_005fSUBNORM"></span>
74<span id="index-DBL_005fHAS_005fSUBNORM"></span>
75<span id="index-LDBL_005fHAS_005fSUBNORM"></span>
76<span id="index-FLT_005fTRUE_005fMIN"></span>
77<span id="index-DBL_005fTRUE_005fMIN"></span>
78<span id="index-LDBL_005fTRUE_005fMIN"></span>
79<span id="index-FLT_005fMAX"></span>
80<span id="index-DBL_005fMAX"></span>
81<span id="index-LDBL_005fMAX"></span>
82<span id="index-FLT_005fDECIMAL_005fDIG"></span>
83<span id="index-DBL_005fDECIMAL_005fDIG"></span>
84<span id="index-LDBL_005fDECIMAL_005fDIG"></span>
85
86<dl compact="compact">
87<dt><code>FLT_MIN</code></dt>
88<dt><code>DBL_MIN</code></dt>
89<dt><code>LDBL_MIN</code></dt>
90<dd><p>Defines the minimum normalized positive floating-point values that can
91be represented with the type.
92</p>
93</dd>
94<dt><code>FLT_HAS_SUBNORM</code></dt>
95<dt><code>DBL_HAS_SUBNORM</code></dt>
96<dt><code>LDBL_HAS_SUBNORM</code></dt>
97<dd><p>Defines if the floating-point type supports subnormal (or &ldquo;denormalized&rdquo;)
98numbers or not (see <a href="Special-Float-Values.html#subnormal-numbers">subnormal numbers</a>).
99</p>
100</dd>
101<dt><code>FLT_TRUE_MIN</code></dt>
102<dt><code>DBL_TRUE_MIN</code></dt>
103<dt><code>LDBL_TRUE_MIN</code></dt>
104<dd><p>Defines the minimum positive values (including subnormal values) that
105can be represented with the type.
106</p>
107</dd>
108<dt><code>FLT_MAX</code></dt>
109<dt><code>DBL_MAX</code></dt>
110<dt><code>LDBL_MAX</code></dt>
111<dd><p>Defines the largest values that can be represented with the type.
112</p>
113</dd>
114<dt><code>FLT_DECIMAL_DIG</code></dt>
115<dt><code>DBL_DECIMAL_DIG</code></dt>
116<dt><code>LDBL_DECIMAL_DIG</code></dt>
117<dd><p>Defines the number of decimal digits <code>n</code> such that any
118floating-point number that can be represented in the type can be
119rounded to a floating-point number with <code>n</code> decimal digits, and
120back again, without losing any precision of the value.
121</p></dd>
122</dl>
123
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