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+.. highlight:: cpp
+
+.. _lang-longlong:
+
+``long long``
+=============
+
+The ``long long`` data type stores extended size integer values.  You
+can use a ``long long`` when your values are too large to fit into an
+:ref:`int <lang-int>`.  A ``long long`` occupies 8 bytes of memory.
+This yields a range of approximately -9.2×10^18 to 9.2×10^18 (that's
+9.2 billion billion, or about 92 million times the number of stars in
+the Milky Way galaxy).  The exact range of a ``long long`` on the
+Maple is from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807,
+or -2^63 to (2^63-1).  A ``long long`` it is subject to the same
+:ref:`overflow issues <lang-variables-rollover>` as any numeric data
+type.
+
+A synonym for the ``long long`` type is ``int64``.
+
+Here's an example of declaring a long long (see :ref:`integer
+constants <lang-constants-integers-u-l>` for an explanation of the
+"LL" at the end of the number)::
+
+        // Speed of light in nanometers per second (approximate).
+        long long c = 299792458000000000LL;
+
+The general syntax for declaring an ``long long`` variable named ``var``,
+then giving it value ``val``, looks like::
+
+    long long var = val;
+
+This is identical to the ``int`` syntax, with ``long long`` (or, at
+your option, ``int64``) replacing ``int``.
+
+Note that ``long long`` values will still :ref:`overflow
+<lang-int-overflow>`, just like ``int`` values, but their much larger
+range makes this less likely to happen.
+
+The downside to using a ``long long`` instead of an ``int`` (besides
+the extra storage) is that :ref:`arithmetic <lang-arithmetic>`
+operations on ``long long``\ s will take slightly longer than on
+``int``\ s.
+
+See Also
+--------
+
+-  :ref:`char <lang-char>`
+-  :ref:`unsigned char <lang-unsignedchar>`
+-  :ref:`int <lang-int>`
+-  :ref:`unsigned int <lang-unsignedint>`
+-  :ref:`unsigned long long <lang-unsignedlonglong>`
+-  :ref:`Integer Constants <lang-constants-integers>`
+-  :ref:`Variables <lang-variables>`
+
+.. include:: /arduino-cc-attribution.txt