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36 lines
1.1 KiB
Markdown
36 lines
1.1 KiB
Markdown
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Title: Numerical Definitions
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SPDX-License-Identifier: LGPL-2.1-or-later
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SPDX-FileCopyrightText: 2001 Havoc Pennington
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SPDX-FileCopyrightText: 2010 Red Hat, Inc.
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# Numerical Definitions
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GLib offers mathematical constants such as [const@GLib.PI] for the value of pi;
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many platforms have these in the C library, but some don’t. The GLib
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versions always exist.
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The [type@GLib.FloatIEEE754] and [type@GLib.DoubleIEEE754] unions are used to
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access the sign, mantissa and exponent of IEEE floats and doubles. These unions
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are defined as appropriate for a given platform. IEEE floats and doubles are
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supported (used for storage) by at least Intel, PPC and Sparc. See
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[IEEE 754-2008](http://en.wikipedia.org/wiki/IEEE_float)
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for more information about IEEE number formats.
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## Floating Point
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* [const@GLib.IEEE754_FLOAT_BIAS]
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* [const@GLib.IEEE754_DOUBLE_BIAS]
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* [type@GLib.FloatIEEE754]
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* [type@GLib.DoubleIEEE754]
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## Numerical Constants
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* [const@GLib.E]
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* [const@GLib.LN2]
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* [const@GLib.LN10]
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* [const@GLib.PI]
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* [const@GLib.PI_2]
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* [const@GLib.PI_4]
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* [const@GLib.SQRT2]
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* [const@GLib.LOG_2_BASE_10]
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