FRACTION (real-number)

  Class:  Elemental function - Generic

  Returns the fractional part of the model representation of the
  argument value.

  The result type is the same as the argument.  The real model is
  described in the HP Fortran for OpenVMS Language Reference Manual.

  Example:

  If 3.0 is a REAL*4 value, FRACTION (3.0) has the value 0.75.