[f2py] Basic question?

[Andreas Kring]

Hello,

I'm new to f2py and have a very basic question. Consider the follow 
fortran90 file (called test.f90) and the following few lines of python.

---
subroutine add(x,y,z)

implicit none
integer::x,y,z

z=x+y

end subroutine add
---

$ f2py -c test.f90 -m test

 >>> from routine import add
 >>> a,b,c=1,2,7
 >>> add(a,b,c)
 >>> c
7

Why is c not equal to 3? Shouldn't this be the case when comparing to 
the example in the Users Guide 
(http://cens.ioc.ee/projects/f2py2e/usersguide/index.html#introduction)?

Kind regards
Andreas