ATAND (real-number)

  Class:  Elemental function - Generic

  Returns the arc tangent of the argument in degrees.  The value of
  the argument must be greater than 0.

  +------+---------+----------+------------+-------------+
  | Args | Generic | Specific |  Argument  | Result Type |
  +------+---------+----------+------------+-------------+
  |   1  |  ATAND  | ATAND    | REAL*4     | REAL*4      |
  |      |         | DATAND   | REAL*8     | REAL*8      |
  |      |         | QATAND   | REAL*16    | REAL*16     |
  +------+---------+----------+------------+-------------+