Fortran AND C interoperability

[Hruod]

Hi people

I really need a help in this issue. I've got two huge system written in Fortran and C. Now I need to send a Matrix from the Fortran code to the C code where this matrix is represented as a double**
I've tried to find help in internet, but it seems for this very especific case this information is quite rare.
Do you can help me ?
Fortran pass everythins by reference, in case of this matrix I simply don't now how to handle it in the c code!!!

 

[ArkM]

Fortran and C are different languages (;-). Linkage of C and Fortran sources in the monolitic module depends on your compilers, so see these implementations manuals (search Fortran/C interface, calling conventions etc in corresponding manuals).

As usually, call by reference is represented in C as type* (pass a pointer but not a pointer to pointer). But your Fortran compiler may pass an array descriptor (not a pointer to the 1st array element). I think in no circumstances Fortran passes type**...

 

[xwb]

Also depends on which version of Fortran. F2003 has a C interface. Also check that the types are the same size: double precision in Fortran may or may not be the same as double in C.

Some variants double the range as well as the precision; others just double the precision but not the range.

If the compilers are from different sources then you may be out of luck.