Dear all,

I have a question concerning F90, I hope, I it is allowed to answer such a question in this forum.

I have the following simple program:

module mytest

implicit none

integer,private :: n

contains

subroutine test

print*,'test === ',n

end subroutine test

end module mytest C%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

program main

use mytest

implicit none

integer :: n

n = 10

print*,'main === ',n

call test

end program main

How can I communicate n = 10 from the main program to the module? Is there an easy way to do this. I won't use a common block for n.

Thaks in advance

module mytest

implicit none

!integer,private :: n

contains

subroutine test (n)

integer, intent(in) :: n

print*,'test === ',n

end subroutine test

end module mytest

!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

program main

use mytest

implicit none

integer :: n

n = 10

print*,'main === ',n

call test (n)

end program main

Thanks Peter

but this is not what I ment, In you suggestion the variabe n in the module is only known in the subroutine test. What I' d like to get is that n will be known in the whole module mytest.

Matthias

Write a subroutine set in module mytest:

subroutine set(nn) integer, intent(in) :: nn

n=nn

end subroutine set

Hope this helps.

Markus

Thanks,

easy solution , but what happens if I have more than only one (say 100) of such variable to communicate from the program main to the module. There I need a subroutine set with a very long data exchange header Is this the only one solution?

regards

Matthias

You could use an array or a type, e.g.:

type TestData

integer :: par1,par2,par3

end type TestData

subroutine set(data)

type (TestData), intent(in) :: data

par1 = data%par1

par2 = data%par2

par3 = data%par3

end subroutine set

That looks fine !

Thanks Matthias

Hi,

While I am here, does anyone know of an online forum that deals with fortran related questions for fluid flow problems or problems in general?

Thanks.