BTEST (integer, position)

  Class:  Elemental function - Generic

  Returns a logical value of true if the bit within the integer
  specified by position is set to 1 (bit test).  The low-order bit is
  position 0.

  +------+---------+----------------+------------+-------------+
  | Args | Generic | Specific       |  Argument  | Result Type |
  +------+---------+----------------+------------+-------------+
  |   2  |         |   --           | INTEGER*1  | LOGICAL*4   |
  |      |         | BITEST         | INTEGER*2  | LOGICAL*2   |
  |      |  BTEST  | BTEST(see note)| INTEGER*4  | LOGICAL*4   |
  |      |         | BKTEST         | INTEGER*8  | LOGICAL*8   |
  +------+---------+----------------+------------+-------------+

  NOTE: Or BJTEST