The  REAL_SIZE  qualifier  lets  you  specify   the   default   size   for
   floating-point data.

   The format of the REAL_SIZE qualifier is as follows:

      /REAL_SIZE={SINGLE}
                 {DOUBLE}
                 {GFLOAT}
                 {SFLOAT}
                 {TFLOAT}
                 {XFLOAT}

   The default floating-point size applies to  all  floating-point  variables
   whose  size  is not explicitly declared.  See the Compaq BASIC for OpenVMS
   Alpha and VAX Systems User Manual for more information  on  floating-point
   data types.

   The default is /REAL_SIZE = SINGLE.