Interfacing Modula-2 and "C"

[Michael Riedl]

Gaius,

I need a little support.

If I define a procedure, e.g.

PROCEDURE MatrixOperation(VAR A : ARRAY OF ARRAY OF REAL;

                                                M,N : CARDINAL);

and want to actually implement the routine in "C" without using a 
definition module of the form "DEFINITION MODULE FOR "C" xyz", then I 
can define the "C" counterpart as

void MatrixOperation(double *A,

                                   unsigned int high2,

                                   unsigned int high1,

                                   unsigned int M,

                                   unsigned int N)

or with

struct MATRIX {
        double       *Adr;
        unsigned int  high2;
        unsigned int  high1;
};

void MatrixOperation(struct MATRIX A,
              unsigned int  M, unsigned int N)

Which one is the correct form ? The documentation would indicate the 
struct form, but not 100 % sure. Essential is that I can safely evaluate 
the high value(s) to do some checks.

Thanks in advance

Michael