# Fortran to Julia struct
**URL:** https://discourse.julialang.org/t/fortran-to-julia-struct/79081
**Category:** New to Julia
**Tags:** question, fortran, array
**Created:** [April 6, 2022, 2:49am UTC](https://discourse.julialang.org/t/fortran-to-julia-struct/79081 "2022-04-06T02:49:26Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@james3](https://discourse.julialang.org/u/james3)
#### Post date: [April 6, 2022, 2:49am UTC](https://discourse.julialang.org/t/fortran-to-julia-struct/79081/1 "2022-04-06T02:49:26Z")
I’m having some difficulty calling some Fortran code from Julia. I have some Fortran code like the following
```julia
module fortranjulia
use, intrinsic :: iso_c_binding
implicit none
type, bind(c) :: m_t
integer(c_int) :: a1
real(c_double) :: a2(3)
end type m_t
contains
subroutine print_mytype(m) bind(C, name = "print_mytype")
type(m_t), intent(in) :: m
print *, m%a1
print *, m%a2
end subroutine print_mytype
end module
```
Which I compile using `ifort -shared -lifcore -fPIC fortranjulia.f90 -o fortran_julia.so` or `gfortran -shared -fPIC fortranjulia.f90 -o fortran_julia.so`.
On the Julia side I have
```julia
using StaticArrays
using Parameters
@with_kw mutable struct m_t
a1::Cint = 123456
a2::MVector{3, Cdouble} = [1.0, 2.0, 3.0]
end
m = m_t()
println("Julia")
println(m.a1)
println(m.a2)
println("Fortran")
ccall((:print_mytype, "/path/to/fortran_julia"), Cvoid, (Ref{m_t},), m)
```
However, the output is mangled for the array when calling the Fortran code.
```julia
Julia
123456
[1.0, 2.0, 3.0]
Fortran
123456
6.914404822817115E-310 0.000000000000000E+000 6.914470367016270E-310
```
What am I do wrong with the arrays? Thanks.
---
### Author:  [@jling](https://discourse.julialang.org/u/jling)
#### Post date: [April 6, 2022, 3:10am UTC](https://discourse.julialang.org/t/fortran-to-julia-struct/79081/2 "2022-04-06T03:10:12Z")
> [@james3](#):
>
> `MVector`
this needs to be `SVector`
or alternatively:
> [@james3](#):
>
> `a2::NTuple{3, Cdouble} = (1.0, 2.0, 3.0)`