void
something(a,b,c)
    double a
    double b
    double c

##</code><code>##

double a = (double) SvNV( ST(1) );
double b = (double) SvNV( ST(2) );
double c = (double) SvNV( ST(3) );

##</code><code>##

void
something(array)
    double * array
    CODE:
       array = (double *) (MAJIK_STUFF(ST))