NUMBER:  82

  ERROR CODE:  F

  MESSAGE TEXT:  undefined exponentiation

  EXPLANATION:  An exponentiation that is mathematically undefined
  was attempted, for example, 0.**0.  The result returned for
  floating-point operations was the reserved operand, -0 for
  VAX-format floating-point and NaN for IEEE-format floating-point.
  For integer operations, zero is returned.