nextun.F

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      Function nextun()
C                                 Returns an unallocated FORTRAN i/o unit.
      Logical ex
C
      Do 10 n = 10, 300
         INQUIRE (unit=n, opened=ex)
         If (.NOT. ex) then
            nextun = n
            Return
         Endif
 10   Continue
      stop ' There is no available I/O unit. '
C               *************************
      End