test

Sun Studio 12: Fortran Programming Guide

11.5.2.1 32-bit Platforms

A Fortran function returning COMPLEX or DOUBLE COMPLEX on 32-bit platforms is equivalent to a C function with an additional first argument that points to the return value in memory. The general pattern for the Fortran function and its corresponding C function is:

Fortran function  

C function  

 

COMPLEX FUNCTION CF( a1,a2,...,an)


cf_ (return, a1, a2, ..., an)
 struct { float r, i; } *return

Table 11–13 Function Returning COMPLEX Data (32–bit SPARC)

Fortran calls C  

C calls Fortran  

 

COMPLEX U, V, RETCPX
EXTERNAL RETCPX
U = ( 7.0, -8.0)
V = RETCPX(U)
...

------------------------------

struct complex { float r, i; };
void retcpx_( temp, w )
struct complex *temp, *w;
{
   temp->r = w->r + 1.0;
   temp->i = w->i + 1.0;
   return;
}


struct complex { float r, i; };
struct complex c1, c2;<
struct complex *u=&c1, *v=&c2;
extern retfpx_();
u -> r = 7.0;
u -> i = -8.0;
retfpx_( v, u );
...

------------------------------

COMPLEX FUNCTION RETFPX(Z)
  COMPLEX Z
  RETFPX = Z + (1.0, 1.0)
  RETURN
END