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.. highlight:: cpp
.. _lang-unsignedlong:
unsigned long
=============
Description
-----------
An unsigned version of the :ref:`long <lang-long>` data type. An
``unsigned long`` occupies 8 bytes of memory; it stores an integer
from 0 to 2^64-1, which is approximately 1.8×10^19 (18 quintillion, or
18 billion billion).
Like an :ref:`unsigned int <lang-unsignedint>`, an ``unsigned long``
won't store negative numbers; it is also subject to the same
:ref:`overflow issues <lang-int-overflow>` as any integral data type.
Here is an example of declaring an ``unsigned long`` variable named
``c``, then giving it value 299,792,458,000,000,000 (see :ref:`integer
constants <lang-constants-u-l>` for an explanation of the "L" at the
end of the number)::
// Speed of light in nanometers per second (approximate).
unsigned long c = 299792458000000000L;
The general syntax for declaring an ``unsigned long`` variable named
``var``, then giving it value ``val``, looks like::
unsigned long var = val;
See Also
--------
- :ref:`long <lang-long>`
- :ref:`int <lang-int>`
- :ref:`unsigned <lang-unsignedint>`
- :ref:`char <lang-char>`
- :ref:`unsigned char <lang-unsignedchar>`
- :ref:`Integer Constants <lang-constants-integers>`
- :ref:`Variables <lang-variables>`
.. include:: cc-attribution.txt
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