F$TYPE

   Returns the data type of a symbol. The string INTEGER is returned
   if the symbol is equated to an integer, or if the symbol is
   equated to a string whose characters form a valid integer.

   The string STRING is returned if the symbol is equated to a
   character string whose characters do not form a valid integer.

   If the symbol is undefined, a null string ("")  is returned.

   Format

     F$TYPE(symbol-name)

Additional information available:

Return_Value    Argument        Examples