Hi ALL:

  In FORTRAN, there are two types of real floating number, single

and double precision. Single precision has 6 significant digits

while double precision has 16. ( when represented in 10 based )

   From what I learned from some numerical analysis books, the

floating point system is machine dependent. Say there are other

system used in Cray and IBM mainframe that are other than the

IEEE SP/DP system.

   Now how can I write a FORTRAN90 code that works in lower significant

number only. Say only works for 3, 4, or 10 digits?

  Thanks,