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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