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+*********
+int2hex()
+*********
+
+Purpose
+=======
+
+int2hex(num)
+
+Returns a hexadecimal number string of a given positive integer num.
+
+.. note::
+
+   When a negative integer is given the return value will be the
+   `Two's complement <https://en.wikipedia.org/wiki/Two%27s_complement>`_ of
+   the input number.
+
+
+Example
+=======
+
+
+Positive Integer given
+----------------------
+
+In the following example the hexadecimal number of 61 is returned
+as a string.
+
+.. code-block:: none
+
+   int2hex(61)
+
+produces
+
+.. code-block:: none
+
+   3d
+
+
+Negative Integer given
+----------------------
+
+This example shows the result on a 64-bit system when a negative
+integer such as -13 is put into the function.
+
+.. code-block:: none
+
+   int2hex(-13)
+
+produces
+
+.. code-block:: none
+
+   fffffffffffffff3
+
+