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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Limits of Basic Types</title><meta name="generator" content="DocBook XSL Stylesheets V1.65.1"><link rel="home" href="index.html" title="GLib Reference Manual"><link rel="up" href="glib-fundamentals.html" title="GLib Fundamentals"><link rel="previous" href="glib-Basic-Types.html" title="Basic Types"><link rel="next" href="glib-Standard-Macros.html" title="Standard Macros"><link rel="chapter" href="glib.html" title="GLib Overview"><link rel="refentry" href="glib-building.html" title="Compiling the GLib package"><link rel="refentry" href="glib-cross-compiling.html" title="Cross-compiling the GLib package"><link rel="refentry" href="glib-compiling.html" title="Compiling GLib Applications"><link rel="refentry" href="glib-running.html" title="Running GLib Applications"><link rel="refentry" href="glib-changes.html" title="Changes to GLib"><link rel="refentry" href="glib-resources.html" title="Mailing lists and bug reports"><link rel="chapter" href="glib-fundamentals.html" title="GLib Fundamentals"><link rel="refentry" href="glib-Basic-Types.html" title="Basic Types"><link rel="refentry" href="glib-Limits-of-Basic-Types.html" title="Limits of Basic Types"><link rel="refentry" href="glib-Standard-Macros.html" title="Standard Macros"><link rel="refentry" href="glib-Type-Conversion-Macros.html" title="Type Conversion Macros"><link rel="refentry" href="glib-Byte-Order-Macros.html" title="Byte Order Macros"><link rel="refentry" href="glib-Numerical-Definitions.html" title="Numerical Definitions"><link rel="refentry" href="glib-Miscellaneous-Macros.html" title="Miscellaneous Macros"><link rel="refentry" href="glib-Atomic-Operations.html" title="Atomic Operations"><link rel="chapter" href="glib-core.html" title="GLib Core Application Support"><link rel="refentry" href="glib-The-Main-Event-Loop.html" title="The Main Event Loop"><link rel="refentry" href="glib-Threads.html" title="
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href="glib-Limits-of-Basic-Types.html#id2976388" title="Description"><link rel="section" href="glib-Limits-of-Basic-Types.html#id2976400" title="Details"><meta name="generator" content="GTK-Doc V1.2 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table class="navigation" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle"><td><a accesskey="p" href="glib-Basic-Types.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="glib-fundamentals.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">GLib Reference Manual</th><td><a accesskey="n" href="glib-Standard-Macros.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr></table><div class="refentry" lang="en"><a name="glib-Limits-of-Basic-Types"></a><div class="titlepage"><div></div><div></div></div><div class="refnamediv"><h2><span class="refentrytitle">Limits of Basic Types</span></h2><p>Limits of Basic Types — portable method of determining the limits of the standard types.</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
#include <glib.h>
#define <a href="glib-Limits-of-Basic-Types.html#G-MININT-CAPS">G_MININT</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXINT-CAPS">G_MAXINT</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXUINT-CAPS">G_MAXUINT</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MINSHORT-CAPS">G_MINSHORT</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXSHORT-CAPS">G_MAXSHORT</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXUSHORT-CAPS">G_MAXUSHORT</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MINLONG-CAPS">G_MINLONG</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXLONG-CAPS">G_MAXLONG</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXULONG-CAPS">G_MAXULONG</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MININT8-CAPS">G_MININT8</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXINT8-CAPS">G_MAXINT8</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXUINT8-CAPS">G_MAXUINT8</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MININT16-CAPS">G_MININT16</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXINT16-CAPS">G_MAXINT16</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXUINT16-CAPS">G_MAXUINT16</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MININT32-CAPS">G_MININT32</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXINT32-CAPS">G_MAXINT32</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXUINT32-CAPS">G_MAXUINT32</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MININT64-CAPS">G_MININT64</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXINT64-CAPS">G_MAXINT64</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXUINT64-CAPS">G_MAXUINT64</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXSIZE-CAPS">G_MAXSIZE</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MINFLOAT-CAPS">G_MINFLOAT</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXFLOAT-CAPS">G_MAXFLOAT</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MINDOUBLE-CAPS">G_MINDOUBLE</a>
#define <a href="glib-Limits-of-Basic-Types.html#G-MAXDOUBLE-CAPS">G_MAXDOUBLE</a>
</pre></div><div class="refsect1" lang="en"><a name="id2976388"></a><h2>Description</h2><p>
These macros provide a portable method to determine the limits of some of
the standard integer and floating point types.
</p></div><div class="refsect1" lang="en"><a name="id2976400"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id2976406"></a><h3><a name="G-MININT-CAPS"></a>G_MININT</h3><a class="indexterm" name="id2976416"></a><pre class="programlisting">#define G_MININT INT_MIN
</pre><p>
The minimum value which can be held in a <a href="glib-Basic-Types.html#gint"><span class="type">gint</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2976440"></a><h3><a name="G-MAXINT-CAPS"></a>G_MAXINT</h3><a class="indexterm" name="id2976450"></a><pre class="programlisting">#define G_MAXINT INT_MAX
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#gint"><span class="type">gint</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2976474"></a><h3><a name="G-MAXUINT-CAPS"></a>G_MAXUINT</h3><a class="indexterm" name="id2976484"></a><pre class="programlisting">#define G_MAXUINT UINT_MAX
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#guint"><span class="type">guint</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2976508"></a><h3><a name="G-MINSHORT-CAPS"></a>G_MINSHORT</h3><a class="indexterm" name="id2976518"></a><pre class="programlisting">#define G_MINSHORT SHRT_MIN
</pre><p>
The minimum value which can be held in a <a href="glib-Basic-Types.html#gshort"><span class="type">gshort</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2976542"></a><h3><a name="G-MAXSHORT-CAPS"></a>G_MAXSHORT</h3><a class="indexterm" name="id2976553"></a><pre class="programlisting">#define G_MAXSHORT SHRT_MAX
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#gshort"><span class="type">gshort</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2976576"></a><h3><a name="G-MAXUSHORT-CAPS"></a>G_MAXUSHORT</h3><a class="indexterm" name="id2976587"></a><pre class="programlisting">#define G_MAXUSHORT USHRT_MAX
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#gushort"><span class="type">gushort</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2976610"></a><h3><a name="G-MINLONG-CAPS"></a>G_MINLONG</h3><a class="indexterm" name="id2976621"></a><pre class="programlisting">#define G_MINLONG LONG_MIN
</pre><p>
The minimum value which can be held in a <a href="glib-Basic-Types.html#glong"><span class="type">glong</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2976644"></a><h3><a name="G-MAXLONG-CAPS"></a>G_MAXLONG</h3><a class="indexterm" name="id2976655"></a><pre class="programlisting">#define G_MAXLONG LONG_MAX
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#glong"><span class="type">glong</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2976678"></a><h3><a name="G-MAXULONG-CAPS"></a>G_MAXULONG</h3><a class="indexterm" name="id2976689"></a><pre class="programlisting">#define G_MAXULONG ULONG_MAX
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#gulong"><span class="type">gulong</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2976713"></a><h3><a name="G-MININT8-CAPS"></a>G_MININT8</h3><a class="indexterm" name="id2976723"></a><pre class="programlisting">#define G_MININT8 ((gint8) 0x80)
</pre><p>
The minimum value which can be held in a <a href="glib-Basic-Types.html#gint8"><span class="type">gint8</span></a>.
</p><p>Since 2.4
</p></div><hr><div class="refsect2" lang="en"><a name="id2976751"></a><h3><a name="G-MAXINT8-CAPS"></a>G_MAXINT8</h3><a class="indexterm" name="id2976763"></a><pre class="programlisting">#define G_MAXINT8 ((gint8) 0x7f)
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#gint8"><span class="type">gint8</span></a>.
</p><p>Since 2.4
</p></div><hr><div class="refsect2" lang="en"><a name="id2976790"></a><h3><a name="G-MAXUINT8-CAPS"></a>G_MAXUINT8</h3><a class="indexterm" name="id2976801"></a><pre class="programlisting">#define G_MAXUINT8 ((guint8) 0xff)
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#guint8"><span class="type">guint8</span></a>.
</p><p>Since 2.4
</p></div><hr><div class="refsect2" lang="en"><a name="id2976829"></a><h3><a name="G-MININT16-CAPS"></a>G_MININT16</h3><a class="indexterm" name="id2976840"></a><pre class="programlisting">#define G_MININT16 ((gint16) 0x8000)
</pre><p>
The minimum value which can be held in a <a href="glib-Basic-Types.html#gint16"><span class="type">gint16</span></a>.
</p><p>Since 2.4
</p></div><hr><div class="refsect2" lang="en"><a name="id2976868"></a><h3><a name="G-MAXINT16-CAPS"></a>G_MAXINT16</h3><a class="indexterm" name="id2976879"></a><pre class="programlisting">#define G_MAXINT16 ((gint16) 0x7fff)
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#gint16"><span class="type">gint16</span></a>.
</p><p>Since 2.4
</p></div><hr><div class="refsect2" lang="en"><a name="id2976907"></a><h3><a name="G-MAXUINT16-CAPS"></a>G_MAXUINT16</h3><a class="indexterm" name="id2976918"></a><pre class="programlisting">#define G_MAXUINT16 ((guint16) 0xffff)
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#guint16"><span class="type">guint16</span></a>.
</p><p>Since 2.4
</p></div><hr><div class="refsect2" lang="en"><a name="id2976946"></a><h3><a name="G-MININT32-CAPS"></a>G_MININT32</h3><a class="indexterm" name="id2976956"></a><pre class="programlisting">#define G_MININT32 ((gint32) 0x80000000)
</pre><p>
The minimum value which can be held in a <a href="glib-Basic-Types.html#gint32"><span class="type">gint32</span></a>.
</p><p>Since 2.4
</p></div><hr><div class="refsect2" lang="en"><a name="id2976984"></a><h3><a name="G-MAXINT32-CAPS"></a>G_MAXINT32</h3><a class="indexterm" name="id2976995"></a><pre class="programlisting">#define G_MAXINT32 ((gint32) 0x7fffffff)
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#gint32"><span class="type">gint32</span></a>.
</p><p>Since 2.4
</p></div><hr><div class="refsect2" lang="en"><a name="id2977023"></a><h3><a name="G-MAXUINT32-CAPS"></a>G_MAXUINT32</h3><a class="indexterm" name="id2977034"></a><pre class="programlisting">#define G_MAXUINT32 ((guint32) 0xffffffff)
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#guint32"><span class="type">guint32</span></a>.
</p><p>Since 2.4
</p></div><hr><div class="refsect2" lang="en"><a name="id2977062"></a><h3><a name="G-MININT64-CAPS"></a>G_MININT64</h3><a class="indexterm" name="id2977073"></a><pre class="programlisting">#define G_MININT64 G_GINT64_CONSTANT(0x8000000000000000)
</pre><p>
The minimum value which can be held in a <a href="glib-Basic-Types.html#gint64"><span class="type">gint64</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2977097"></a><h3><a name="G-MAXINT64-CAPS"></a>G_MAXINT64</h3><a class="indexterm" name="id2977108"></a><pre class="programlisting">#define G_MAXINT64 G_GINT64_CONSTANT(0x7fffffffffffffff)
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#gint64"><span class="type">gint64</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2977132"></a><h3><a name="G-MAXUINT64-CAPS"></a>G_MAXUINT64</h3><a class="indexterm" name="id2977143"></a><pre class="programlisting">#define G_MAXUINT64 G_GINT64_CONSTANT(0xffffffffffffffffU)
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2977167"></a><h3><a name="G-MAXSIZE-CAPS"></a>G_MAXSIZE</h3><a class="indexterm" name="id2977178"></a><pre class="programlisting">#define G_MAXSIZE G_MAXUINT
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#gsize"><span class="type">gsize</span></a>.
</p><p>Since 2.4
</p></div><hr><div class="refsect2" lang="en"><a name="id2977206"></a><h3><a name="G-MINFLOAT-CAPS"></a>G_MINFLOAT</h3><a class="indexterm" name="id2977217"></a><pre class="programlisting">#define G_MINFLOAT FLT_MIN
</pre><p>
The minimum positive value which can be held in a <a href="glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a>.
</p><p>
If you are interested in the smallest value which can be held in a <a href="glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a>,
use -G_MAX_FLOAT.
</p></div><hr><div class="refsect2" lang="en"><a name="id2977253"></a><h3><a name="G-MAXFLOAT-CAPS"></a>G_MAXFLOAT</h3><a class="indexterm" name="id2977264"></a><pre class="programlisting">#define G_MAXFLOAT FLT_MAX
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a>.
</p></div><hr><div class="refsect2" lang="en"><a name="id2977287"></a><h3><a name="G-MINDOUBLE-CAPS"></a>G_MINDOUBLE</h3><a class="indexterm" name="id2977298"></a><pre class="programlisting">#define G_MINDOUBLE DBL_MIN
</pre><p>
The minimum positive value which can be held in a <a href="glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>.
</p><p>
If you are interested in the smallest value which can be held in a <a href="glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>,
use -G_MAXDOUBLE.
</p></div><hr><div class="refsect2" lang="en"><a name="id2977334"></a><h3><a name="G-MAXDOUBLE-CAPS"></a>G_MAXDOUBLE</h3><a class="indexterm" name="id2977346"></a><pre class="programlisting">#define G_MAXDOUBLE DBL_MAX
</pre><p>
The maximum value which can be held in a <a href="glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>.
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