..  _log2:

LOG2
====

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| Syntax   |  LOG2 (x)                                                         |
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| Location |  Math Package                                                     |
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This function returns the logarithm to the base 2 of the given number,
which is calculated as LN(x)/LN(2).

**Example**

The greatest number which can be handled by SuperBASIC is returned by
INF as 1.61585E616. This is exactly 2\ :sup:`2047`, because
LOG2(INF)=2047 (ie. x=2\ :sup:`LOG2(x)`).

**CROSS-REFERENCE**

:ref:`log10`, :ref:`ln`,
:ref:`inf`.