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author | Hanna Mendes Levitin <hanna@anomaly-3.local> | 2010-12-01 03:37:07 -0600 |
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committer | Hanna Mendes Levitin <hanna@anomaly-3.local> | 2010-12-01 03:37:07 -0600 |
commit | 5a7dd1bea32458a4afc038984a903959134b82d3 (patch) | |
tree | 4171e71c34841212585f855a3fbdf8aaf3b9bb4e /source/lang/cpp/unsignedlong.rst | |
parent | 8e42d34c8d3c81c037a3acaca553ea8c5e4f25aa (diff) | |
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docs, now with style
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diff --git a/source/lang/cpp/unsignedlong.rst b/source/lang/cpp/unsignedlong.rst new file mode 100644 index 0000000..14a4fc3 --- /dev/null +++ b/source/lang/cpp/unsignedlong.rst @@ -0,0 +1,41 @@ +.. highlight:: cpp + +.. _lang-unsignedlong: + +``unsigned long`` +================= + +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-integers-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 |