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How can I realize if a program is in F77 or F90

How can I realize if a program is in F77 or F90

How can I realize if a program is in F77 or F90

(OP)
Hi, I have a subroutine but I could not realize if it is written in F77 or F90!
 I know the following difference between f90 and f77:
at the end of do commands is END DO in f90 but CONTINUE in f77
The comment line start with ! in f90 but c in f77

The subroutine contains the following commands:

 c *** plastic strain tensor
      do i = 4, ncomp
         ustatev(i+1) = 0.5d0 * ustatev(i+1)
      end do

Is that in f90 or f77?
How can I realize if a program is in F77 or F90?
 

RE: How can I realize if a program is in F77 or F90

(OP)
Thanks, I have found the answer!
 Everything that is in Fortran 77 is also in Fortran 90
 

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