Double precision in Fortran?

Unless you are looking to maintain the code under both compilers, perhaps you would be better off just changing the source code to use real*8's. That would get it behaving consistently when you do ports in the future too.

2 Much better to use Fortran properly and specify the kind of your variables as TED suggests. Even better than REAL*8 would be a standard-compliant way of declaring this, REAL(KIND=KIND(1d0)), or, for extra portability and future proofness REAL(KIND=SELECTED_REAL_KIND(x,y)) -- but you have to figure out x and y for your program. – gh Performance Mark Oct 7 '09 at 11:18 I agree.

REAL*8 isn't portable, but processor and compiler dependent. Using KIND is the way it should be done if portability is needed. – ldigas Oct 11 '09 at 0:08.

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