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module callback_05
implicit none
contains
subroutine px_call3(f, x)
integer, intent(in) :: x
interface
subroutine f(x)
integer, intent(in) :: x
end subroutine
end interface
call f(x)
end subroutine
subroutine px_call2(f, x)
integer, intent(in) :: x
interface
subroutine f(x)
integer, intent(in) :: x
end subroutine
end interface
call px_call3(f, x)
end subroutine
subroutine px_call1(x)
integer, intent(in) :: x
call px_call2(printx, x)
contains
subroutine printx(x)
integer, intent(in) :: x
print *, x
end subroutine
end subroutine
end module callback_05
program main
use callback_05
implicit none
integer :: x = 5
call px_call1(x)
end program main
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